Synonyms of at once

at once

phrase

1

as in concurrently

at one and the same time

I have three papers due all at once.

Synonyms & Similar Words

• concurrently
• simultaneously
• together
• coincidently
• in unison
• immediately
• contemporaneously
• coincidentally
• near
• close
• narrowly

Antonyms & Near Antonyms

• separately
• apart
• independently
• individually
• singly
• successively
• consecutively

2

as in now

without delay

Call me at once when you get this message.

Synonyms & Similar Words

• now
• immediately
• directly
• promptly
• instantly
• right
• right now
• soon
• shortly
• right off
• suddenly
• right away
• presently
• in no time
• on the spot
• away
• straight off
• quickly
• on the double
• forthwith
• headlong
• on a dime
• instantaneously
• straightway
• straightaway
• PDQ
• incontinently
• off the bat
• momentarily
• abruptly
• plumb
• pronto
• rapidly
• quick
• bang
• instanter
• freely
• swiftly
• readily
• swift
• hastily
• fast
• unexpectedly
• speedily
• briskly
• apace
• anon
• exactly
• recklessly
• impetuously
• fleetly
• rashly
• impulsively
• snappily
• presto
• full-tilt
• punctually
• posthaste
• opportunely
• seasonably

Antonyms & Near Antonyms

• slowly
• late
• tardily

Example Sentences

Recent Examples of at once

Finally, leaders should avoid trying to transform everything at once. — Arthur Zaczkiewicz, Footwear News, 16 Sep. 2026

Later in his career, De Kooning tried drawing with his eyes closed or with both hands at once. — Sebastian Smee, The Atlantic, 16 Sep. 2026

Meanwhile, Saban’s even doing pro-PCSA ads, which seems like several conflicts of interest at once, but that kinda stuff is for people without nine-figure career earnings to worry about. — Jason Kirk, New York Times, 15 Sep. 2026

One pump dispenses both formulas at once, so there’s no extra layering required. — Emily Orofino, Allure, 15 Sep. 2026