一斉(いっせい)

いっせい
adverb/no-adjective
all at once, simultaneously
1. all at once, simultaneously
Many things or people doing something at the same time together.
花(はな)が一斉(いっせい)に咲(さ)いた。
The flowers all bloomed at once.
一斉(いっせい)に立(た)ち上(あ)がった。
Everyone stood up at once.
合図(あいず)とともに、選手(せんしゅ)たちが一斉(いっせい)に走(はし)り出(だ)した。
At the signal, the athletes all started running at once.

一斉(いっせい) indicates many people or things acting at the same time. It emphasizes the coordinated, simultaneous nature of the action.

FORMS:

  • Adverb: 一斉(いっせい)に (all at once)
  • Modifier: 一斉(いっせい)の + noun (simultaneous ~)

COMMON COLLOCATIONS:

  • 一斉(いっせい)に立(た)ち上(あ)がる: to stand up all at once
  • 一斉(いっせい)検査(けんさ): simultaneous inspection/crackdown
  • 一斉(いっせい)攻撃(こうげき): coordinated attack
  • 一斉(いっせい)送信(そうしん): mass broadcast/transmission
  • 一斉(いっせい)休業(きゅうぎょう): simultaneous closure

SIMILAR WORDS:

  • 同時(どうじ)に: at the same time — neutral, factual
  • 一斉(いっせい)に: all at once — emphasizes coordinated group action
  • 一気(いっき)に: all in one go — emphasizes doing something without stopping
general
Added 2026.1.9 20:57 · Revised 2026.3.30 13:48
01500/01726_issei