isolated
nonrecurring
one-shot
once
yance
oncet
one-off
just a sec
hapax legomenon
once-in-a-lifetime
barely
scarcely
uniradiate
just
uniradiated
only
hardly
monotemporal
only if
only when
scarce
minute
unoccasional
tick
go-round
intraday
semioccasionally
semioccasional
in one case
fixed-term
monocausal
one time
twice
infrequently
nonconsecutive
micromomentary
uninstantiated
outright
preoccurrence
sporadical
twicet
unijugate
transient
bidaily
unilamellate
opportunity seldom knocks twice
for once
concurrence
nonoccurrence
promptly
rehash
semelparous
I can't remember the last time
right away
anomalism
nonce
bad things come in threes
uncommonly
aborted
once or twice
unreminded
unsuccessive
nonrepeated
doubt
subchronic
wee
ever
one-time
microrepeat
quondam
as it happens
incoincident
once in a blue moon
in two jumps
coincidentally
semirare
repeat
rareish
unapertured
unifoliolate
in no time
contemporary
recur
although
contemporaneous
every once in a while
just now
rare as a four-leaf clover
straightway
untimed
nonapertured
unoccasioned
nontimed

English words for 'occurring only once.'

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