一いっ斉せいに

い

っ

せ

い

に

Common wordJLPTN2Freq.FrequencyTop 50,000

Meanings

adverb

simultaneously; all at once; in unison

Describes multiple people or things doing the same action at the same moment, often with a sense of coordinated or spontaneous unity.

生せい徒とたちは一いっ斉せいに立たち上あがった。
The students stood up all at once.
花はな火びが一いっ斉せいに打うち上あげられた。
Fireworks were launched simultaneously.

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Usage patterns

〈人ひと〉が一いっ斉せいに〈動どう詞し〉for a group of people to all do something at the same moment
生せい徒とたちが一いっ斉せいに立たち上あがった。
The students all stood up at once.
一いっ斉せいに始はじまるfor multiple things to start all at the same time
花はな火びが一いっ斉せいに始はじまった。
The fireworks all started at the same time.
一いっ斉せいに拍はく手しゅするfor everyone to applaud together at once
観かん客きゃくが一いっ斉せいに拍はく手しゅした。
The audience applauded all together.
一いっ斉せいに動うごき出だすfor multiple things to start moving simultaneously
信しん号ごうが変かわると、車くるまが一いっ斉せいに動うごき出だした。
When the light changed, all the cars started moving at once.

Kanji

一one, one radical (no.1)
斉adjusted, alike, equal

Related words

同どう時じに
同時に simply means 'at the same time' without implying coordinated group action, while 一斉に stresses that many people or things act together as one.
揃そろって
揃って means 'together' or 'as a complete group' and often implies physical gathering, whereas 一斉に focuses on the exact simultaneity of the action.
こぞって
一斉に stresses that everyone acts at exactly the same moment, while こぞって stresses that everyone acts together in agreement or participation.
どっとN2
いっせいに stresses coordinated simultaneity, while どっと stresses a sudden, forceful rush or outburst.
一いっ挙きょにN1
一斉に describes many people or things acting simultaneously together, while 一挙に describes one action that handles everything at once.

Opposites· 9

順じゅん番ばんに
順番に means 'in turn, one at a time', the opposite of 一斉に, which means everyone acts at the same instant.
順じゅん々じゅんにN1
一斉に means 'all at once, simultaneously', the opposite of 順々に's step-by-step, one-at-a-time progression.
逐ちく次じ
一斉に means 'all at once, simultaneously', the opposite of 逐次's one-by-one, sequential sense.

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一ひとつ一ひとつ
一斉に means 'all at once, simultaneously', the opposite of 一つ一つ's meaning of doing things one at a time in sequence.
順じゅん々じゅんN2
一斉に means 'all at once, simultaneously', the opposite of 順々, which means doing things one after another in order.
順じゅん次じ
一斉に means all at once/simultaneously, the opposite of 順次, which means one after another in sequence.
口くち々ぐち
一斉に means everyone acting or speaking at exactly the same moment, the opposite of 口々に (くちぐちに), which describes people speaking separately or in turn.
思おもい思おもい
一斉に describes everyone doing something together at the same time in a uniform way, the opposite of 思い思い where each person acts individually and differently.
段だん階かい的てきN1
段階的 means proceeding stage by stage, whereas 一斉に means everyone or everything acting simultaneously, with no staggering.

Etymology

Compound of 一 (one) and 斉 (equal, uniform), with the adverbial particle に. The kanji 斉 conveys the idea of things being aligned or uniform, giving the sense of simultaneous, coordinated action.