At once
At once adverb - Without delay or hesitation; with no time intervening.
Once upon a time and at once are semantically related. In some cases you can use "Once upon a time" instead an adverb phrase "At once".
Once upon a time
At once and once upon a time are semantically related. Sometimes you can use "At once" instead an adverb phrase "Once upon a time".
Mutual synonyms
Cite this Source
Once upon a time and At once. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/at_once/once_upon_a_time
At once & Once upon a time. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/at_once/once_upon_a_time>.
Once upon a time or At once. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/at_once/once_upon_a_time.
