dual
pair
couple
duo
duad
dyad
twosome
distich
couplet
twain
yoke
span
duet
brace
apposition
mate
partner
double
duplet
pendant
ditrochaic
interitem
fellow
complement
doubleton
binary
bimaterial
blend
bipartite
both
two-part
two-way
two-piece
bi-
subitem
multiple
opposite
intercouple
go-together
ducks
twofold
twos
deuces
separator
either
contrapair
lap joint
compound
counterpart
superposition
intrapair
homointerface
pinch
omnibus
bidoped
vice versa
contenement
coinoculated
adherence
two pair
match
interpair
let alone
ditrochean
up
dualize
doublet
tridem
comparable
element
every other
bill
dock
interelement
betweenity
other
biune
overpost
makeup
combine
cobinding
two of a kind
half
acey-deucey
interobjective
homodisubstituted
latter
intersperse
dyadic
tertium quid
layaway
duodecillionth
multipronged
double
ditrochaic
interitem
binary
bimaterial
bipartite
two-part
two-way
two-piece
opposite
twofold
compound
intrapair
omnibus
bidoped
coinoculated
dual
interpair
ditrochean
up
comparable
every other
interelement
biune
half
interobjective
homodisubstituted
latter
dyadic
multipronged
vice versa
dual
pair
couple
duo
duad
dyad
twosome
distich
couplet
twain
yoke
span
duet
brace
apposition
mate
partner
duplet
pendant
fellow
complement
doubleton
blend
subitem
multiple
go-together
ducks
twos
deuces
separator
contrapair
lap joint
counterpart
superposition
homointerface
contenement
adherence
two pair
match
doublet
tridem
element
bill
betweenity
other
overpost
makeup
cobinding
two of a kind
acey-deucey
tertium quid
layaway
duodecillionth
latter
intercouple
pinch
dualize
dock
combine
intersperse
noun
- Of an item that is one of a pair, the other item in the pair.
- Of a vector in an inner product space, the linear functional corresponding to taking the inner product with that vector. The set of all duals is a vector space called the dual space.
- The dual number.
- Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces.
adj
- Pertaining to two, pertaining to a pair of.
- Characterized by having two (usually equivalent) components.
- Pertaining to a grammatical number in certain languages that refers to two of something, such as a pair of shoes.
- Exhibiting duality.
- Being the dual of some other category; containing the same objects but with source and target reversed for all morphisms.
- Being the space of all linear functionals of (some other space).
verb
noun
- One of the constituent items that make up a pair.
- Two similar or identical things taken together; often followed by of.
- A couple of working animals attached to work together, as by a yoke.
- A boat for two sweep rowers.
- A score of zero runs (a duck) in both innings of a two-innings match.
- Used with binary nouns (often in the plural to indicate multiple instances, since such nouns are plural only, except in some technical contexts)
- A double play, two outs recorded in one play.
- The exclusion of one member of a parliamentary party from a vote, if a member of the other party is absent for important personal reasons.
- Two members of opposite parties or opinion, as in a parliamentary body, who mutually agree not to vote on a given question, or on issues of a party nature during a specified time.
- In a mechanism, two elements, or bodies, which are so applied to each other as to mutually constrain relative motion; named in accordance with the motion it permits, as in turning pair, sliding pair, twisting pair.
- A doubleheader, two games played on the same day between the same teams
- A poker hand that contains two cards of identical rank, which cannot also count as a better hand.
- A pair of breasts
- A pair of testicles
- Two people in a relationship, partnership or friendship.
verb
- To engage (oneself) with another of opposite opinions not to vote on a particular question or class of questions.
- To group into one or more sets of two.
- To bring two (animals, notably dogs) together for mating.
- To suit; to fit, as a counterpart.
- To come together for mating.
- to link two electronic devices wirelessly together, especially through a protocol such as Bluetooth
noun
- two items of the same kind
- fabric comprising a fitted part at the top of a garment
- an oppressive power
- a pair of draft animals joined by a yoke
- support consisting of a wooden frame across the shoulders that enables a person to carry buckets hanging from each end
- a connection (like a clamp or vise) between two things so they move together
- stable gear that joins two draft animals at the neck so they can work together as a team
verb
noun
- two items of the same kind
- the complete duration of something
- the distance or interval between two points
- a unit of length based on the width of the expanded human hand (usually taken as 9 inches)
- a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
- the act of sitting or standing astride
verb
noun
- two items of the same kind
- a support that steadies or strengthens something else
- a set of two similar things considered as a unit
- either of two punctuation marks ({ or }) used to enclose textual material
- a rope on a square-rigged ship that is used to swing a yard about and secure it
- elastic straps that hold trousers up
- an appliance that corrects dental irregularities
- a carpenter's tool having a crank handle for turning and a socket to hold a bit for boring
- a structural member used to stiffen a framework
verb
noun
- A placing of two things side by side, or the fitting together of two things.
- A public disputation by scholars.
- The growth of successive layers of a cell wall.
- Appositio, the addition of an element not syntactically required.
- The relationship between such nouns or noun phrases.
- The quality of being side-by-side, apposed instead of being opposed, not being front-to-front but next to each other.
- A construction in which one noun or noun phrase is placed with another as an explanatory equivalent, both of them having the same syntactic function in the sentence.
- A (now purely ceremonial) speech day at St Paul's School, London.
noun
- The other member of a matched pair of objects.
- Friendly term of address to a stranger, usually male, of similar age.
- A technical assistant in certain trades (e.g. gasfitter's mate, plumber's mate); sometimes an apprentice.
- A breeding partner.
- In naval ranks, a non-commissioned officer or his subordinate (e.g. Boatswain's Mate, Gunner's Mate, Sailmaker's Mate, etc).
- A ship's officer, subordinate to the master on a commercial ship.
- A suitable companion; a match; an equal.
- A first mate.
- A friend, usually of the same sex.
- A fellow, comrade, colleague, partner or someone with whom something is shared, e.g. shipmate, classmate.
- The abovementioned plant; the leaves and shoots used for the tea
verb
- To arrange in matched pairs.
- To copulate with.
- To match, fit together without space between.
- To introduce (animals) together for the purpose of breeding.
- To match oneself against; to oppose as equal; to compete with.
- To move (a space shuttle orbiter) onto the back of an aircraft that can carry it.
- To come together as companions, comrades, partners, etc.
- To copulate.
- To marry; to match (a person).
- To pair in order to raise offspring.
- To fit (objects) together without space between.
noun
- One of each halves of a pair of someone or something that belongs together.
- A spouse or other person with whom one shares a domestic, romantic or sexual bond.
- Someone with whom one plays on the same side in a game, such as card games or doubles tennis.
- Someone with whom one dances in a two-person dance.
- One of the pieces of wood comprising the framework which strengthens the deck of a wooden ship around the holes through which the mast and other fittings pass.
- A group financial arrangement in which each member contributes a set amount of money over a set period.
- A member of a business or law partnership.
verb
adj
- Made up of two matching or complementary elements.
- Folded in two; composed of two layers.
- Having two aspects; ambiguous.
- False, deceitful, or hypocritical.
- Stooping; bent over.
- Of flowers, having more than the normal number of petals.
- Of twice the quantity.
- Of time, twice as fast.
- Of a family relationship, related on both the maternal and paternal sides of a family.
- Designed for two users.
- Of an instrument, sounding an octave lower.
noun
- The narrow outermost ring on a dartboard.
- Twice the number, amount, size, etc.
- A ghostly apparition of a living person; a doppelgänger.
- A two-base hit.
- A strike in which the object ball is struck so as to make it rebound against the cushion to an opposite pocket.
- Playing the same part on two instruments, alternately.
- A sharp turn, especially a return on one's own tracks.
- Synonym of double-quick (“fast marching pace”)
- A bet on two horses in different races in which any winnings from the first race are placed on the horse in the later race.
- A double-precision floating-point number.
- A former French coin worth one-sixth of a sou.
- A call that increases certain scoring points if the last preceding bid becomes the contract.
- A double feast.
- A redundant item for which an identical item already exists.
- A tile that has the same value (i.e., the same number of pips) on both sides.
- A person who resembles and stands in for another person, often for safety purposes
- Two competitions, usually one league and one cup, won by the same team in a single season.
- A drink with two portions of alcohol.
- A hit on this ring.
- A boat for two scullers.
- The feat of scoring twice in one game.
- The feat of winning two events in a single meet or competition.
- A copper coin worth one-eighth of a penny.
adv
verb
- To get a two-base hit.
- To act as substitute for (another theatrical performer in a certain role, etc).
- To serve a second role or have a second purpose.
- To turn sharply, following a winding course.
- To increase by 100%, to become twice as large in size.
- To fold over so as to make two folds.
- To operate as a double agent.
- To be the double of; to exceed by twofold; to contain or be worth twice as much as.
- (often followed by together or up) To join or couple.
- To be capable of performing (upon an additional instrument).
- To play (both one part and another, in the same play, etc).
- To double down.
- To multiply by two.
- (sometimes followed by up) To clench (a fist).
- To make a call that will double certain scoring points if the preceding bid becomes the contract.
- To transmit simultaneously on the same channel as another station, either unintentionally or deliberately, causing interference.
- To multiply the strength or effect of by two.
- To duplicate (a part) either in unison or at the octave above or below it.
- To unite, as ranks or files, so as to form one from each two.
- To repeat exactly; copy.
- To sail around (a headland or other point).
- To go or march at twice the normal speed.
- To cause (a ball) to rebound from a cushion before entering the pocket.
noun
- One of a pair; a counterpart.
- A short rope hanging down, used to attach hooks for tackles; a pennant.
- A lamp hanging from the roof.
- A piece of jewellery which hangs down as an ornament, especially worn on a chain around the neck.
- A long narrow flag at the head of the principal mast in a royal ship.
- The dangling part of an earring.
- An ornament of wood or of stone hanging downwards from a roof.
- A supporting post attached to the main rafter.
- The stem and ring of a watch, by which it is suspended.
adj
noun
- either of two parts that mutually complete each other
- a word or phrase used to complete a grammatical construction
- a complete number or quantity
- number needed to make up a whole force
- something added to complete or embellish or make perfect
- one of a series of enzymes in the blood serum that are part of the immune response
verb
adj
- Having two equally important parts; related to something with two parts.
- Of an operation, function, procedure, or logic gate, taking exactly two operands, arguments, parameters, or inputs; having domain of dimension 2.
- Focusing on two mutually exclusive conditions.
- Concerning logic whose subject matter concerns binary states.
- Being in one of two mutually exclusive states.
- Of data, consisting coded values (e.g. machine code) not interpretable as plain or ASCII text (e.g. source code).
- Concerning numbers and calculations using the binary number system.
noun
- Synonym of binary asteroid.
- Synonym of binary star.
- Synonym of binary file; a file consisting of data other than human-readable text.
- Synonym of binary planet.
- The bijective base-2 numeral system, which uses only the digits 0 and 1.
- A state in which only two values are possible, in which something must have one value or the other.
prefix
noun
- One of a set of the same thing; a duplicate.
- A whole number that can be divided by another number with no remainder.
- A single individual who has multiple personalities.
- One of a set of siblings produced by a multiple birth.
- A discovery resulting from the work of many people throughout history, not merely the work of the person who makes the final connection.
- Price-earnings ratio.
- A chain store.
- More than one piercing in a single ear.
adj
adj
- consisting of two or more substances or ingredients or elements or parts
- composed of many distinct individuals united to form a whole or colony
verb
- make more intense, stronger, or more marked
- put or add together
- calculate principal and interest
- create by mixing or combining
- combine so as to form a whole; mix
noun
- a whole formed by a union of two or more elements or parts
- (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
- an enclosure of residences and other building (especially in the Orient)
- a word (as anthropology, kilocycle, builder) consisting of any of various combinations of words, combining forms, or affixes.
adj
noun
- Either of two parts that fit together, or complement one another.
- One who or that which resembles another.
- A duplicate of a legal document.
- One who or that which has corresponding functions or characteristics.
- Either half of a flattened fossil when the rock has split along the plane of the fossil.
verb
noun
- The placing of one thing on top of another.
- The deposition of one stratum over another; the principle that in a series of sedimentary strata, the lower strata are the older.
- The situation in quantum mechanics where two or more quantum states are added together (superposed) to yield another valid quantum state.
adj
verb
- To squeeze between two objects.
- Of clothing, to be uncomfortably tight in specific spots.
- To arrest or capture.
- To squeeze between the thumb and forefinger.
- To sail so close-hauled that the sails begin to flutter.
- To take hold; to grip, as a dog does.
- To steal, usually something inconsequential.
- To cramp; to straiten; to oppress; to starve.
- To move, as a railroad car, by prying the wheels with a pinch.
- To cut shoots or buds of a plant in order to shape the plant, or to improve its yield.
- To squeeze a small amount of a person's skin and flesh, making it hurt.
- To seize; to grip; to bite.
noun
- A close compression of anything with the fingers.
- A small amount of powder or granules, such that the amount could be held between fingertip and thumb tip.
- An awkward situation of some kind (especially money or social) which is difficult to escape.
- An organic herbal smoke additive.
- A magnetic compression of an electrically-conducting filament.
- The narrow part connecting the two bulbs of an hourglass.
- The action of squeezing a small amount of a person's skin and flesh, making it hurt.
- An arrest.
- A metal bar used as a lever for lifting weights, rolling wheels, etc.
adj
- Containing multiple items.
- Of a transportation service, calling at every station, as opposed to express; local.
verb
noun
- An anthology of previously released material linked together by theme or author, especially in book form.
- A broadcast programme consisting of all of the episodes of a serial that have been shown in the previous week.
- A stamp issue, usually commemorative, that appears simultaneously in several countries as a joint issue.
noun
- A pair of items or entities with mutually suitable characteristics.
- A device made of wood or paper, at the tip coated with chemicals that ignite with the friction of being dragged (struck) against a rough dry surface.
- Any contest or trial of strength or skill, or to determine superiority.
- Equality of conditions in contest or competition.
- A candidate for matrimony; one to be gained in marriage.
- A competitive sporting event such as a boxing meet, a baseball game, or a cricket match.
- Equivalence; a state of correspondence.
- A marriage.
- Suitability.
- An agreement or compact.
- A perforated board, block of plaster, hardened sand, etc., in which a pattern is partly embedded when a mould is made, for giving shape to the surfaces of separation between the parts of the mould.
- Someone with a measure of an attribute equaling or exceeding the object of comparison.
verb
- To make a successful match or pairing.
- To agree; to be equal; to correspond.
- To equal or exceed in achievement.
- To agree with; to be equal to; to correspond to.
- To fit together, or make suitable for fitting together; specifically, to furnish with a tongue and groove at the edges.
- To be an example of a rule or regex.
adj
conj
- not to mention, as well as; used after one item, to introduce a further item which is entailed by the first.
- Much less; to say nothing of; used after one negative clause to introduce another, usually broader and more important clause, whose negation is implied by the negation of the first. However either of these instances mentioned can be applied with the use of let alone.
verb
adj
- Said of the higher-ranking pair in a two pair.
- Traveling towards a major terminus.
- At university (especially Oxford or Cambridge).
- Aloft.
- Larger; greater in quantity, volume, value etc.
- Functional; working.
- Raised; lifted.
- Above the horizon, in the sky.
- well-known; renowned
- Awake and out of bed.
- Willing; ready.
- Indicating a larger or higher quantity.
- Headed or designated to go upward (as an escalator, stairway, elevator etc.) or toward (as a run-up).
- Finished, to an end
- On or at a physically higher level.
- Chilled and served without ice.
- Erect.
- Ahead; leading; winning.
- Happening; new; of concern. See also what's up, what's up with.
- Facing upwards.
- Well-informed; current.
- In a good mood.
- Built, constructed.
- Fitted or fixed at a high or relatively high position, especially on a wall or ceiling.
- Available to view or use; made public; posted.
- Riding the horse; mounted.
- Standing; upright.
- Next in a sequence.
prep
- From south to north of.
- At (a given place, especially one imagined to be higher or more distant from a central location).
- From the mouth towards the source of (a river or waterway).
- Further along (in any direction).
- Of a man: having sex with.
- Toward the center, source, or main point of reference; toward the end at which something is attached.
- Toward the top of.
adv
- Away from the surface of the Earth or other planet; in opposite direction to the downward pull of gravity.
- Aside or away, so as no longer to be present or in use.
- Towards or at a central place, or any place that is visualised as 'up' by virtue of local features or local convention, or arbitrarily, irrespective of direction or elevation change.
- To or from one's possession or consideration.
- To or at a physically higher or more elevated position.
- Used as an aspect marker to indicate a completed action or state; thoroughly, completely.
- To or in a position of equal advance or equality; not short of, back of, less advanced than, away from, etc.; usually followed by to or with.
- Towards the principal terminus, towards milepost zero.
- In a positive vertical direction.
- North.
- Against the wind or current.
- To a higher level of some quantity or notional quantity, such as price, volume, pitch, happiness, etc.
- Without additional ice.
- Relatively close to the batsman.
verb
- To upload.
- To physically raise or lift.
- To increase the level or amount of.
- To promote.
- To rise to a standing position; hence, by extension, to act suddenly; see also up and.
noun
noun
- A pair of two similar or equal things; couple.
- A very small flowering plant, Dimeresia howellii.
- Either of two dice, each of which, when thrown, has the same number of spots on the face lying uppermost.
- A man’s waistcoat.
- A man’s close-fitting jacket, with or without sleeves, worn by European men from the 1400s to the 1600s.
- A word (or rather, a halfword) consisting of two bytes.
- One of two or more different words in a language derived from the same etymological root but having different phonological forms (e.g., toucher and toquer in French or shade and shadow in English).
- An imitation gem made of two pieces of glass or crystal with a layer of color between them.
- A quantum state of a system with a spin of ½, such that there are two allowed values of the spin component, −½ and +½.
- In textual criticism, two different narrative accounts of the same actual event.
- A word or phrase set a second time by mistake.
- A word ladder puzzle.
- An arrangement of two lenses for a microscope, designed to correct spherical aberration and chromatic dispersion, thus rendering the image of an object more clear and distinct.
- Dipole antenna.
noun
- One of the objects in a set.
- A small part of the whole.
- A required aspect or component of a cause of action. A deed is regarded as a violation of law only if each element can be proved.
- Atmospheric forces such as strong winds and rains.
- Any one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.
- An orbital element; one of the parameters needed to uniquely specify a particular orbit.
- One of the four basic building blocks of matter in theories of ancient philosophers and alchemists: water, earth, fire, and air.
- A basic, simple substance out of which something is made, raw material.
- The basic principles of a field of knowledge, basics, fundamentals, rudiments.
- One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based.
- A small but present amount of a quality, a hint.
- A group of people within a larger group having a particular common characteristic.
- One of the conceptual objects in a markup language, usually represented in text by tags.
- A factor, one of the conditions contributing to a result.
- Any of the teeth of a zip fastener.
- A component in electrical equipment, often in the form of a coil, having a high resistance, thereby generating heat when a current is passed through it.
- An infinitesimal interval of a quantity, a differential.
- The bread and wine taken at Holy Communion.
- A place or state of being that an individual or object is best suited to.
- One of the entries of a matrix.
noun
- A set of items presented together.
- A writing binding the signer or signers to pay a certain sum at a future day or on demand, with or without interest, as may be stated in the document; a bill of exchange. In the United States, it is usually called a note, a note of hand, or a promissory note.
- The beak of a bird, especially when small or flattish; sometimes also used with reference to a platypus, turtle, or other animal.
- Of a cap or hat: the brim or peak, serving as a shade to keep sun off the face and out of the eyes.
- A written list or inventory. (Now obsolete except in specific senses or set phrases; bill of lading, bill of goods, etc.)
- A document, originally sealed; a formal statement or official memorandum. (Now obsolete except with certain qualifying words; bill of health, bill of sale etc.)
- The extremity of the arm of an anchor; the point of or beyond the fluke (also called the peak).
- A cutting instrument, with hook-shaped point, and fitted with a handle, used in pruning, etc.; a billhook.
- The bell, or boom, of the bittern.
- A written note of goods sold, services rendered, or work done, with the price or charge; an invoice.
- Any of various bladed or pointed hand weapons, originally designating an Anglo-Saxon sword, and later a weapon of infantry, especially in the 14th and 15th centuries, commonly consisting of a broad, heavy, double-edged, hook-shaped blade, with a short pike at the back and another at the top, attached to the end of a long staff.
- A piece of paper money; a banknote.
- One hundred dollars.
- A pickaxe, or mattock.
- A beak-like projection, especially a promontory.
- Somebody armed with a bill; a billman.
- A draft of a law, presented to a legislature for enactment; a proposed or projected law.
- A paper, written or printed, and posted up or given away, to advertise something, as a lecture, a play, or the sale of goods
verb
verb
- To join two moving items.
- To move a spaceship into its dock/berth under its own power.
- To engage in the sexual practice of docking (where the tip of one participant's penis is inserted into the foreskin of the other participant).
- To cut off, bar, or destroy.
- To pierce with holes, as pricking pastry or dough with a fork to prevent excessive rising in the oven.
- To cut off a section of an animal's tail, to practise a caudectomy.
- To land at a harbour.
- To drag a user interface element (such as a toolbar) to a position on screen where it snaps into place.
- To reduce (wages); to deduct from.
- To place (an electronic device) in its dock.
noun
- The place of arrival and departure of a train in a railway station.
- A section of a hotel or restaurant.
- A device designed as a base for holding a connected portable appliance such as a laptop computer (in this case, referred to as a docking station), or a mobile telephone, for providing the necessary electrical charge for its autonomy, or as a hardware extension for additional capabilities.
- Any of the genus Rumex of coarse weedy plants with small green flowers related to buckwheat, especially bitter dock (Rumex obtusifolius), and used as potherbs and in folk medicine, especially in curing nettle rash.
- A fixed structure attached to shore to which a vessel is secured when in port.
- A burdock plant, or the leaves of that plant.
- The fleshy root of an animal's tail.
- A toolbar that provides the user with a way of launching applications, and switching between running applications.
- An act of docking; joining two things together.
- Part of a courtroom where the accused sits.
- A structure attached to shore for loading and unloading vessels.
- The part of the tail which remains after the tail has been docked.
- A leather case to cover the clipped or cut tail of a horse.
- The body of water between two piers.
noun
verb
verb
- To have two or more things or properties that function together.
- In the game of casino, to play a card which will take two or more cards whose aggregate number of pips equals those of the card played.
- To come together; to unite.
- To bring (two or more things or activities) together; to unite.
noun
- Especially, a joint enterprise of whatever legal form for a purpose of business or in any way promoting the interests of the participants, sometimes with monopolistic or fraudulent intentions.
- An artwork falling between painting and sculpture, having objects embedded into a painted surface.
- An industrial conglomeration in a socialist country, particularly in the former Soviet bloc.
- A Test match in which applicants play in the hope of earning a position on a professional football team.
- A combine harvester
adj
English words for 'Of an item that is one of a pair, the other item in the pair.'
As you may have noticed, above you will find words for "Of an item that is one of a pair, the other item in the pair.". Hover the mouse over the word you'd like to know more about to view its definition. Click 
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