At once
At once adverb - Without delay or hesitation; with no time intervening.
In an instant and at once are semantically related in immediately topic. In some cases you can use "In an instant" instead an adverb phrase "At once".
In an instant
At once and in an instant are semantically related in immediately topic. You can use "At once" instead an adverb phrase "In an instant".
Mutual synonyms
Related pairs
- first and at once
- first and in an instant
- immediately and at once
- immediately and in an instant
- timely and at once
- timely and in an instant
- directly and at once
- directly and in an instant
- straight away and at once
- straight away and in an instant
- quickly and at once
- quickly and in an instant
- promptly and at once
- promptly and in an instant
Both terms in one sentence
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In an instant, he absorbs all of the Nazis' flesh at once, leaving a pile of joined husks.
Source: Finger Poke of Doom - Careful use of these can wipe out an entire field of enemies, give giant boosts to your entire team at once, and even bring an entire team back to life with full health in an instant.
Source: Difficult but Awesome - Additionally, button combinations could allow you to shoot an entire clip of the battle rifle at once or punch someone while shooting them, both resulting in an instant kill when done correctly.
Cite this Source
In an instant and At once. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/at_once/in_an_instant
At once & In an instant. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/at_once/in_an_instant>.
In an instant or At once. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/at_once/in_an_instant.
