counterpart
double
binary
apposition
complement
go-together
proportion
dicomplemented
twofold
object complement
dovetail
harmonious
structure
duple
dual
marriage
opposite
pair
duodecillionth
couple
selfconsistent
intercomplementary
segment
complementally
section
fay
combination
two-sided
bilateral
combine
bipartite
homotaxis
bilaterally
coherent
mate
affine
bi-
both
circumposition
match
wedding
partner
match up
half
mediety
relation
moiety
bicomponent
tract
interassemblage
half and half
binomial
coordinative
isodichotomous
bifold
d. in p. aeq.
coalign
two-way
ambigenous
two-part
proportionate
coordinating
nest
in two
divided
commonalty
Frankenstein
compresent
connection
polyfold
cohesion
one-half
proportionality
symmetrical
bielemental
balance
joint
parter
pairing
bifurcated
dyad
complementable
complementarily
intercombine
reconciliation
close-coupled
balancing
shoulder-to-shoulder
twin
crosslinkage
double
binary
dicomplemented
twofold
harmonious
duple
dual
opposite
selfconsistent
intercomplementary
fay
two-sided
bilateral
bipartite
coherent
affine
bicomponent
interassemblage
binomial
coordinative
isodichotomous
bifold
two-way
ambigenous
two-part
proportionate
coordinating
divided
compresent
polyfold
symmetrical
bielemental
bifurcated
complementable
close-coupled
complementally
bilaterally
half
half and half
complementarily
shoulder-to-shoulder
counterpart
apposition
complement
go-together
proportion
object complement
structure
marriage
pair
duodecillionth
couple
segment
section
combination
homotaxis
mate
dual
circumposition
match
wedding
partner
mediety
relation
moiety
tract
half
commonalty
connection
cohesion
one-half
proportionality
balance
joint
parter
pairing
dyad
reconciliation
balancing
twin
crosslinkage
dovetail
combine
match up
couple
d. in p. aeq.
coalign
nest
Frankenstein
intercombine
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
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.
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.
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
- 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
noun
- Harmonious relation of parts to each other or to the whole.
- The relation of one part to another or to the whole with respect to magnitude, quantity, or degree.
- A quantity of something that is part of the whole amount or number.
- A statement of equality between two ratios.
- Size.
- Proper or equal share.
verb
verb
- Of several things: to combine or fit together well.
- To combine or fit (things) together well.
- To unite (components) with a dovetail (noun sense 2.1) or similar joint.
- To interweave (a number of algorithms or subprograms) so that they can be run more or less simultaneously.
noun
- In full dovetail joint: a type of joint where adjoining components are fastened by multiple tenons cut into wedge shapes resembling a dove's tail, which interlock with mortises having corresponding shapes.
- The tail of a dove (family Columbidae); also, something having the shape of a dove's tail.
- A tenon cut into a wedge shape resembling a dove's tail so that it interlocks with a mortise having a corresponding shape in a dovetail joint.
- A line resembling a dovetail joint (sense 2.1).
noun
- A cohesive whole built up of distinct parts.
- The overall form or organization of something.
- The underlying shape of a solid.
- Underwater terrain or objects (such as a dead tree or a submerged car) that tend to attract fish
- A body, such as a political party, with a cohesive purpose or outlook.
- A set along with a collection of finitary functions and relations.
- Several pieces of data treated as a unit.
- A set of rules defining behaviour.
verb
noun
- A joining of two parts.
- The union of two people of opposite sex, to the exclusion of all others.
- A close union.
- In solitaire or patience games, the placing a card of the same suit on the next one above or below it in value.
- A union of two or more people that creates a family tie and carries legal, social, and/or religious rights and responsibilities.
- A wedding; a ceremony in which people wed.
- A king and a queen, when held as a hand in some versions of poker or melded in pinochle.
- The state of being married.
- A homosexual relationship between male prisoners.
- The union of only two people, to the exclusion of all others.
- My grandparents' marriage lasted for forty years.
adj
- Of either of two complementary or mutually exclusive things.
- Facing in the other direction.
- Of leaves and flowers, positioned directly across from each other on a stem.
- Located directly across from something else, or from each other.
- Extremely different; inconsistent; contrary; repugnant; antagonistic.
prep
noun
- Something opposite or contrary to something else.
- An opponent.
- A person or thing that is entirely different from or the reverse of someone or something else; used to show contrast between two people or two things.
- An antonym.
- An additive inverse.
adv
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 of the same kind connected or considered together.
- A small number.
- That which joins or links two things together; a bond or tie; a coupler.
- A couple-close.
- Two partners in a romantic or sexual relationship.
- One of the pairs of plates of two metals which compose a voltaic battery, called a voltaic couple or galvanic couple.
- A turning effect created by forces that sum to zero in magnitude but produce a non-zero external torque.
verb
- To join (two things) together, or (one thing) to (another).
- To cause (two animals) to copulate, to bring (two animals) together for mating.
- To join in sexual intercourse; to copulate.
det
adj
noun
- one of several parts or pieces that fit with others to constitute a whole object
- a self-contained part of a larger composition (written or musical)
- a very thin slice (of tissue or mineral or other substance) for examination under a microscope
- a distinct region or subdivision of a territorial or political area or community or group of people
- a small team of policemen working as part of a police platoon
- one of the portions into which something is regarded as divided and which together constitute a whole
- a land unit equal to 1 square mile
- (geometry) the area created by a plane cutting through a solid
- a small class of students who are part of a larger course but are taught separately
- a division of an orchestra containing all instruments of the same class
- a small army unit usually having a special function
- a specialized division of a large organization
- a segment of a citrus fruit
- the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)
verb
noun
- a collection of things that have been combined; an assemblage of separate parts or qualities
- a coordinated sequence of chess moves
- a sequence of numbers or letters that opens a combination lock
- a group of people (often temporary) having a common purpose
- an alliance of people or corporations or countries for a special purpose (formerly to achieve some antisocial end but now for general political or economic purposes)
- the act of arranging elements into specified groups without regard to order
- the act of combining things to form a new whole
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
- Having a natural or due agreement of parts; harmonious: a coherent design.
- Of waves having the same direction, wavelength and phase, as light in a laser.
- Attaching or pressing against an organ of the same nature.
- Unified; sticking together; making up a whole.
- Belonging to a specific class of sheaves having particularly manageable properties closely linked to the geometrical properties of the underlying space.
- Orderly, logical and consistent.
- Aesthetically ordered.
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.
adj
- Of two materials, having mutual affinity.
- Of or pertaining to a function expressible as f(⃑x)=A⃑x+⃑b (where A is a linear transformation and ⃑b is a constant), which, regarded as a transformation, maps parallel lines to parallel lines and finite points to finite points.
- Assigning finite values to finite quantities.
verb
noun
prefix
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.
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
adv
- In two equal parts or to an equal degree.
- Partially; imperfectly.
- In some part approximating a half.
- Practically, nearly.
adj
- Related through one common grandparent or ancestor rather than two.
- Consisting of a half (½, 50%).
- Having one parent (rather than two) in common.
- Consisting of some indefinite portion resembling a half; approximately a half, whether more or less; partial; imperfect.
noun
- abbreviated form for half marathon.
- Half of a standard measure, chiefly: (Britain) half a pint of beer or cider.
- One of two usually roughly equal parts into which anything may be divided, or considered as divided.
- One of the two opposite parts of the playing field of various sports, in which each starts the game.
- The fraction obtained by dividing 1 by 2.
- Any of the three terms at Eton College, for Michaelmas, Lent, and summer.
- A half sibling.
prep
intj
noun
- The manner in which two things may be associated.
- A set of ordered tuples.
- A set of ordered tuples retrievable by a relational database; a table.
- The act of intercourse.
- Specifically, a set of ordered pairs; a binary relation.
- The act of relating a story.
- A member of one's extended family; a relative.
- A statement of equality of two products of generators, used in the presentation of a group.
- A subobject of a product of objects.
adv
adj
noun
- A mixture of half lemonade and half iced tea.
- A mixture of cream and milk often used in coffee, defined by the US Food and Drug Administration to contain between 10.5% and 18% milk fat.
- Both oral sex and vaginal sex performed in sequence by a prostitute
- A cup of coffee with the equivalent of half a packet of sugar and half a creamer of cream.
- A combination of both rice and chips as an accompaniment to a curry, as opposed to one or the other.
- A mixture of two alcoholic beverages, most frequently those brewed from malt, such as porter and ale or mild and bitter beers, in about equal parts; also used for equal parts of an alcoholic beverage and water.
- A pizza with two different sets of toppings, one on each half.
- A person of mixed race or with dual nationality.
- A combination of beer and ale (or similar alcoholic drinks) in equal quantities.
adj
noun
- A wallet, billfold, or carrying case with a single fold, so that it opens like a book.
- A door, window, shutter, or divider consisting of two equal panels hinged together so that it opens by folding the panels against each other.
- A sheet of paper or cardboard folded in half along a crease down the center.
- A crease or turn that causes something to double back on itself.
verb
noun
- The point at which two or more things are connected.
- A feeling of understanding and ease of communication between two or more people.
- sexual intercourse
- A kinship relationship between people.
- An individual who is related to oneself, through either family or business.
- A drug dealer.
- The description for a Methodist denomination as a whole, as opposed to its constituent churches, circuits, districts and conferences.
- Coherence; lack of disjointedness
- A transfer from one transportation vehicle to another in scheduled transportation service
- A set of sets that contains the empty set, all one-element sets for any element that is included in any of the sets, and the union of any group of sets that are elements where the intersections of those sets is non-empty.
- An established communications or transportation link.
- The act of connecting.
noun
- Degree to which functionally related elements in a system belong together.
- Grammatical or lexical relationship between different parts of the same text.
- Growing together of normally distinct parts of a plant.
- Various intermolecular forces that hold solids and liquids together.
- State of cohering, or of working together.
noun
- harmonious arrangement or relation of parts or elements within a whole (as in a design)
- a state of equilibrium
- equality between the totals of the credit and debit sides of an account
- equality of distribution
- something left after other parts have been taken away
- the difference between the totals of the credit and debit sides of an account
- (mathematics) an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane
- a weight that balances another weight
- a wheel that regulates the rate of movement in a machine; especially a wheel oscillating against the hairspring of a timepiece to regulate its beat
- a scale for weighing; depends on pull of gravity
verb
noun
- The point where two components of a structure join rigidly.
- A marijuana cigarette.
- The means of securing together the meeting surfaces of components of a structure.
- A cut of meat, especially (but not necessarily) (a) one containing a joint in the sense of an articulation or (b) one rolled up and tied.
- The part or space included between two joints, knots, nodes, or articulations.
- A place of business, particularly in the food service or hospitality industries.
- Prison.
- The penis.
- The point where two components of a structure join, but are still able to rotate.
- Any part of the body where two bones join, in most cases allowing that part of the body to be bent or straightened.
- A thing.
- A fracture in which the strata are not offset; a geologic joint.
adj
verb
- To provide with a joint or joints; to articulate.
- To unite by a joint or joints; to fit together; to prepare so as to fit together
- To fit as if by joints; to coalesce as joints do.
- To join; to connect; to unite; to combine.
- To separate the joints; of; to divide at the joint or joints; to disjoint; to cut up into joints, as meat.
noun
- A set of two elements treated as one; a pair.
- A tensor of order two and rank one.
- An element, atom, or radical having a valence of or combining power of two.
- A chromosome structure, usually X- or V-shaped, consisting of two condensed sister chromatids joined by a centromere.
- Two persons in an ongoing relationship; dyadic relationship.
- The relationship or interaction itself in reference to a couple.
- Any set of two different pitch classes.
- A secondary unit of organisation consisting of an aggregate of monads.
noun
- Either of two similar or closely related objects, entities etc.
- A twin size mattress or a bed designed for such a mattress.
- A room in a hotel, guesthouse, etc. with two beds; a twin room.
- A twin crystal.
- A two-engine aircraft.
- Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling.
verb
- To split, part; to go away, depart.
- To separate, divide.
- To join, unite; to form links between (now especially of two places in different countries); to pair with.
- To be, or be like, a pair of twins (for example, to dress identically); to be paired or suited.
- To give birth to twins.
- To be, or be like, a twin to (someone else); to match in some way.
adj
English words for 'Either of two parts that fit together, or complement one another.'
As you may have noticed, above you will find words for "Either of two parts that fit together, or complement one another.". Hover the mouse over the word you'd like to know more about to view its definition. Click 
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