一いっ斉せい

い

っ

せ

い

Common wordJLPTN2Freq.FrequencyTop 10,000

Meanings

1

adverb, noun

simultaneous; all at once

Describes an action performed by many people or things at the same time, often in an organized or coordinated manner. Commonly used with に as an adverb.

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.

警けい察さつは一いっ斉せい捜そう査さを開かい始しした。

The police launched a simultaneous investigation.

Usage patterns

〈人ひと〉が一いっ斉せいに〈動どう詞し〉for a group of people to do something all at once
その知しらせを聞きいて、生せい徒とたちは一いっ斉せいに立たち上あがった。
On hearing the news, the students all stood up at once.
〈場ば所しょ〉で一いっ斉せいに〈動どう詞し〉for something to happen simultaneously across a place
全ぜん国こくの学がっ校こうで一いっ斉せいに休きゅう校こうが発はっ表ぴょうされた。

Kanji

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

Related words

同どう時じN3
同時 means 'at the same time' for any two or more events, while 一斉 specifically stresses a coordinated group acting together, as in 一斉に立つ.
一いち度どにN3
一度に means 'in one go/at one time' and focuses on quantity or repetition happening together, whereas 一斉 focuses on many people or things acting in unison.

Opposites

順じゅん次じ
順次 means 'one after another, in order', the opposite of 一斉's 'all at the same time'.

Word family· 7

一いっ斉せいにN2
simultaneously; all at once; in unison
一いっ斉せい安やす
all-round decline; broad market drop
一いっ斉せい高だか
all-round advance; broad market rise
一いっ斉せい射

Written forms

一いっ斉せいUsage70%
Standard kanji spelling; high-frequency news word.
いっせいUsage30%

Etymology

Compound of 一 (one) and 斉 (equal, uniform). The spelling conveys the idea of doing something in unison.

School closures were announced simultaneously at schools across the country.

しゃ

撃げき

volley firing; fusillade; broadside

一いっ斉せい攻こう撃げき

all-out attack; attack on all fronts; onslaught

Show 2 more

一いっ斉せい検けん挙きょ
wholesale arrest; round-up
一いっ斉せい送そう信しん
simultaneous transmission; sending to multiple recipients; group message