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Happening only once - synonyms or related words

once

adverb

on one occasion only

isolated

adjective

happening only once, or existing only in one place

unrepeatable

adjective

something that is unrepeatable can only be done once or not very often because it is very special

one-off

adjective

British

happening, done, or made only once

once in a lifetime

a once in a lifetime experience is very unusual or special

in/at one fell swoop

with one sudden action, or on one single occasion

one-shot

adjective

happening or done once and not repeated

one-off

noun

British

something that only happens once

(just) this once

used for emphasizing that this is the only time that something will happen

conlang

… a language for human communication which has been invented and has not developed naturally

BuzzWord Article

Open Dictionary

spogs

spectacles; boiled sweets, candy; soft aniseed-flavoured jelly sweets coated with blue and pink sugar sprinkles

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