What does 一斉に mean?
一斉に is a Japanese adverb meaning “all at once” or “simultaneously” in English. It is written as 一斉に in kanji, いっせいに in hiragana, and isseini in romaji. This word is part of JLPT N2 vocabulary.
Example sentences
人々が一斉に走り出した。
Everyone started running all at once.
ベルが鳴ると、生徒たちは一斉に立ち上がった。
When the bell rang, the pupils all stood up together.