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

Love changes her, not all at once but gradually, like a rescue dog. — Amy Nicholson, Los Angeles Times, 22 Oct. 2026

But no one came here expecting to solve all the riddles at once. — Dana O’Neil, CNN Money, 21 Oct. 2026

Later that month, an employee spoke anonymously with WSOC-TV about conditions at the complex, describing concerns about overcrowding, inadequate staffing and employees’ ability to manage multiple violent juveniles at once. — Nora O’Neill 21, Charlotte Observer, 21 Oct. 2026

Unlike a standard microscope, which illuminates an entire sample at once and can produce blurry images, a confocal microscope focuses on one depth level at a time. — Molly Herring, Quanta Magazine, 21 Oct. 2026