At once
At once adverb - Without delay or hesitation; with no time intervening.
Efficiently and at once are semantically related. In some cases you can use "Efficiently" instead an adverb phrase "At once".
Efficiently
Efficiently adverb - With efficiency; in an efficient manner.
At once and efficiently are semantically related. Sometimes you can use "At once" instead an adverb "Efficiently".
Nearby Words: efficient, efficiency
Both terms in one sentence
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Then she learned how to efficiently play Minecraft to the point that she was able to defeat the entirety of Hat Films at once, with her alleged hammy nature being toned down around the same time.
Source: Win the Crowd - Turn-Based Strategy (TBS): A game that is about abstract mechanics of efficiently waging war, exploiting resources and controlling huge groups of combatants all at once.
Source: Videogame Genres -
The Jelly Launcher lets you shoot jellyfish more efficiently, carry more ammo than the net, refuel ammo with jellyfish jars, and you can hold down the shooting button to shoot five jellyfish at once.
Cite this Source
Efficiently and At once. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/at_once/efficiently
At once & Efficiently. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/at_once/efficiently>.
Efficiently or At once. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/at_once/efficiently.
Google Ngram Viewer shows how "at once" and "efficiently" have occurred on timeline