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

The expansion will lengthen the quay and add 15 cranes, allowing the terminal to handle two large container ships at once and cutting turnaround times by up to half, the company said. — semafor.com, 8 Oct. 2026

For the first version, the team used GPT-6 Luna without further training, constrained it to return structured answers, processed multiple questions at once and tuned the system to deliver the first decision faster. — Wen Shao, Fortune, 8 Oct. 2026

Most of these households use multiple strategies, revealing how financial hardship can force people to make several compromises at once. — Sanya Carley, Time, 7 Oct. 2026

Working hard to be horrible and beautiful at once, Vahl’s debut is a stark, memorable vision of right-wing terror ultimately eating its own tail. — Guy Lodge, Variety, 7 Oct. 2026