How to say "simultaneous" in Japanese
Choosing the right word
- 一斉いっせいadverb, nounCovers the 'all at once' sense: many people or things doing something at the same moment, together. It suits a crowd bursting into laughter or applause, rather than two separate events merely overlapping.
- 同時どうじprenominal modifierThe general word for two or more events, actions, or processes occurring at the same time; it also covers 'concurrent' and 'synchronous'. Choose it when things happen in parallel rather than all together.
Use 同時 for two or more events or actions happening at the same time; use 一斉 when many people or things act all at once, together in a single burst.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese equivalents
See also
