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Definitions

at once

ADJECTIVE

immediate

Synonyms

STRONGEST

actual prompt urgent

WEAK

at present time at this moment critical current existing extant first hair-trigger instant live next now on hand paramount present pressing up-to-date

Antonyms

WEAK

away distant eventually far later never

ADVERB

directly

Synonyms

STRONGEST

immediately instantaneously instantly promptly quickly shortly

STRONG

forthwith straightaway

WEAK

anon contiguously dead due first off in a second instanter presently pronto right away speedily straight off

Antonyms

STRONGEST

eventually later

WEAK

indirectly

ADVERB

early

Synonyms

STRONGEST

directly first promptly recently right away soon timely

STRONG

betimes

WEAK

freshly in a jiffy in an instant in no time instantaneously instantly newly presto primitively seasonably straightaway summarily thereon thereupon without delay

Antonyms

STRONGEST

later

WEAK

late

ADVERB

ensemble

Synonyms

STRONG

altogether

WEAK

all at once as a body as a group as a whole as one en masse in concert

ADVERB

forthwith

Synonyms

STRONGEST

abruptly right away

STRONG

directly instantly now straightaway

WEAK

away quickly right now suddenly tout de suite without delay

Antonyms

STRONG

later

ADVERB

hand over fist

Synonyms

WEAK

ASAP amain apace immediately increasingly instantly speedily

ADVERB

in a moment

Synonyms

WEAK

in a trice in a wink in an instance momentarily momently right away very soon

ADVERB

instantaneously

Synonyms

STRONGEST

right away spontaneously

WEAK

directly immediately pronto quickly

ADVERB

instantly

Synonyms

STRONGEST

directly immediately instantaneously right away

STRONG

forthwith now

WEAK

PDQ away double-time first off in a flash instanter on a dime pronto right spontaneously straight away there and then this minute tout de suite without delay

Antonyms

STRONG

later

WEAK

eventually

ADVERB

now

Synonyms

STRONGEST

today

STRONG

directly forthwith immediately instantly nowadays straightaway

WEAK

PDQ any more at the moment at this moment at this time away first off here and now in a minute in a moment in nothing flat instanter just now like now momentarily on the double promptly pronto right away right now soon these days this day

Antonyms

STRONG

eventually later

WEAK

future past

ADVERB

now

Synonyms

STRONG

forthwith instantly straightaway

Antonyms

STRONG

later

WEAK

future past

ADVERB

posthaste

Synonyms

WEAK

breakneck directly double-quick expeditious flat-out fleet fleetly full tilt hastily hasty headlong lickety-split pell-mell promptly pronto quick quickly rapid rapidly speedily speedy straightaway swift swiftly

ADVERB

promptly

Synonyms

STRONGEST

directly expeditiously hastily instantly quickly rapidly speedily swiftly

STRONG

pronto

WEAK

PDQ fast flat-out fleetly in nothing flat lickety-split like a shot now on the dot on the double on time posthaste punctually right away sharp straightaway unhesitatingly

Antonyms

STRONGEST

slowly

WEAK

late negligently

ADVERB

readily

Synonyms

STRONGEST

cheerfully eagerly easily freely gladly immediately promptly willingly

WEAK

at the drop of a hat facilely hands down in a jiffy in no time lightly no sweat nothing to it piece of cake quick as a wink right away slick as whistle smoothly speedily straight away swimmingly unhesitatingly well without delay without demur without difficulty without hesitation

Antonyms

STRONGEST

difficultly grudgingly unwillingly

ADVERB

right

Synonyms

STRONGEST

away straight

STRONG

direct due now

WEAK

first off forthwith immediately instanter instantly promptly quickly right away straight away straightly undeviatingly

Antonyms

WEAK

inaccurately inappropriately incorrectly indirectly unfairly unjustly unsuitably wrongly

ADVERB

right off

Synonyms

WEAK

anon contiguously dead due first off forthwith immediately in a second instant instantaneously instanter instantly now presently promptly pronto quickly right away shortly speedily straight off straightaway

ADVERB

right off the bat

Synonyms

WEAK

immediately instantly on the dot

ADVERB

straight

Synonyms

STRONGEST

away dead right away

STRONG

direct due now right straightaway

WEAK

as the crow flies exactly first off forthwith in direct line instanter instantly lineally point-blank straightforwardly straightly undeviatingly

Antonyms

STRONG

indirectly

WEAK

later

ADVERB

straightaway

Synonyms

STRONG

dead due forthwith immediately instant instantly now right straight

WEAK

anon contiguously direct first off in a second instantaneously instanter presently promptly pronto quickly right away right off shortly speedily straight off

Antonyms

STRONG

eventually indirectly later

ADVERB

straight off

Synonyms

WEAK

anon contiguously dead due first off forthwith immediately in a second instant instantaneously instanter instantly now presently promptly pronto quickly right away right off shortly speedily straightaway

ADVERB

tout de suite

Synonyms

WEAK

in a wink in an instant now pronto right away without delay

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.

"It was a very exciting time with everything happening at once," he added.

From BBC • Jun. 5, 2026

It is an act of truth-telling that can be costly, liberating and sacred all at once.

From Salon • Jun. 5, 2026

There are so many news stories happening at once that it’s risky to say, “I’m going to write one big story, and I’m going to publish it on this day.”

From Slate • Jun. 4, 2026

Like previous seasons, all eight episodes will drop at once.

From MarketWatch • May 31, 2026

Gingersnipes was now battling many serpents at once.

From "The Undead Fox of Deadwood Forest" by Aubrey Hartman

at once

Example Sentences

Related Words