Dictionary.com
Thesaurus.com
Synonyms

at once

Idioms  
  1. At the same time, as in We can't all fit into the boat at once . [First half of 1200s] Also see at one time , def. 1.

  2. Immediately, as in Mother told the children to come inside at once . [First half of 1500s]


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

This shift involves developing treatments that target multiple aspects of the disease at once.

From Science Daily • Apr. 10, 2026

Joseph Perkovich, arguing for Pitchford, tried to do two things at once.

From Slate • Apr. 10, 2026

Two things can be true at once: Your very real fear of flying, which can result in very real physical and psychological distress, and your husband’s window of time to take this trip.

From MarketWatch • Apr. 9, 2026

In the late 90s and the 2000s, television programs still generated pop culture watershed moments that everyone experienced at once.

From Barron's • Apr. 8, 2026

Words come at me all at once from every direction, crash into each other, break apart, and fall away.

From "Red Flags and Butterflies" by Sheryl Azzam