Word
Kana: いっしゅん Romaji: isshun Level: N3

一瞬

Meaning in English

an instant, a moment

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一瞬 - Illustrated Dictionary
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Word context

What it means

What does 一瞬 mean? It denotes a very brief period of time—a single moment. It emphasizes fleetingness or rapid change, often used to describe something that happens suddenly and then vanishes.

Main meanings

  • The primary sense is a single, very brief moment in time.
  • Used to describe fleeting impressions, quick flashes of perception, or sudden changes.
  • In fixed phrases such as 一瞬で and 一瞬の, it signals something occurring in an instant or momentarily.

How to use it

Used to denote a fleeting moment in both spoken and written Japanese; commonly used with 一瞬で or 一瞬の to describe actions or events that happen in an instant; 彼は一瞬の隙をついた, 一瞬で状況が変わった

Variants and close terms

  • 瞬間 (shunkan) — moment
  • 一時 (ichiji) — for a while; momentary duration
  • すぐに (sugu ni) — immediately, right away

Composition

  • 一: number meaning 'one'
  • 瞬: 'moment' or 'instant'; conveys fleeting duration
  • Combined meaning: a single, very brief moment

Etymology

isshun originates from the kanji compound where 瞬 (shun) conveys the idea of a brief moment and 一 (ichi) marks a single unit of time; the reading combines the on'yomi elements into a single pronounced term. The phonetic blending follows standard Sino-Japanese compounding, yielding the current pronunciation.

Word class

noun (名詞)

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