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Happening only once

once

adverb, conjunction, noun

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

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

something that only happens once

(just) this once

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

Open Dictionary

garbage patch

a collection of debris, mostly consisting of plastic, which moves around in the sea …

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