once

[wuhns] / wʌns /

ADJECTIVE

in the past; occurred one time only

Synonyms

STRONGEST

already before earlier formerly previously

STRONG

erstwhile late

WEAK

back back when bygone in the old days in the olden days in times gone by in times past long-ago old on one occasion once only once upon a time one one time before one time previously only one time quondam sometime this time time was whilom

ADVERB

in the past; occurred one time only

Synonyms

STRONGEST

already before earlier formerly late previously

STRONG

erstwhile

WEAK

a single time at one time away back back back when but once bygone heretofore in the old days in the olden days in times gone by in times past long ago old on one occasion once only once upon a time one one time before one time previously only one time quondam sometime this time time was whilom

Antonyms

STRONGEST

currently future later presently

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The antibody portion targets cancer cells, and once it arrives, the attached lectin can bind sialic acid.

From Science Daily

The finding offers early hope against a pathogen that has been difficult to control and nearly impossible to treat once it spreads.

From Science Daily

Batter Steve Smith, who missed the third Test with illness, once again steps up to lead in Cummins' absence, while Todd Murphy comes in to replace Lyon.

From BBC

Discretionary spending has become harder to win, and brands that once relied on premium positioning or Western cachet are finding fewer takers.

From MarketWatch

Initially, it took a little time for everyone on set to see my vision, but once I shared a test image, everyone understood and was excited to collaborate.

From Los Angeles Times

once

Example Sentences

Related Words