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Definition of once

once

/wʌns/
once

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once Lexical Profile

once Game Scores & Validity

• adverb

1

On one occasion or for one time only.

Example

"The committee meets only once a month to review new proposals."


2

At some indefinite time in the past; formerly.

Example

"This quiet valley was once the site of a bustling medieval market town."


3

By a single degree of relationship or stage of removal.

Example

"She invited her first cousin once removed to the family reunion."

Synonyms
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Antonyms
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• conjunction

1

As soon as; when or after a specified condition has been met.

Example

"Once the final data is verified, the research team will publish the findings."

Synonyms
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• noun

1

A single occasion or instance (used chiefly in prepositional phrases such as 'for once' or 'this once').

Example

"For once, the train arrived at the station several minutes ahead of schedule."

Synonyms
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• Rhymes for once

Word Origin & Etymology

From Middle English ones, an adverbial genitive form of Old English an ('one'), with the final '-s' eventually Respawned as '-ce' to reflect the voiceless consonant sound.

Cite this Entry


Wordmom. (2026). Definition of Once. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/once
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