At once
At once adverb - Without delay or hesitation; with no time intervening.
Eventually is an antonym for at once in topics: directly, presently, instantaneous, right now, as soon as possible.
Eventually
Eventually adverb - At a later time.
At once is an antonym for eventually.
Nearby Words: eventual, eventuality
Both terms in one sentence
- He sided with Starscream eventually, betting on the madbot Determinator who had the bearings to attack all the Autobots at once to get what he was after.
Source: The Mole / Western Animation - Three refugees from an Empire lost in a cataclysm, hitting Five Kingdoms practically at once from a volcanic dot just off the coast to eventually weld all Seven of them into just the one Kingdom.
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That really pissed the Sniper off to the point where he eventually slaps all 3 of them at once.
Cite this Source
Eventually and At once. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/at_once/eventually
At once & Eventually. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/at_once/eventually>.
Eventually or At once. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/at_once/eventually.
Google Ngram Viewer shows how "at once" and "eventually" have occurred on timeline