Word
Kana: かいし Romaji: kaishi Level: N3

開始

Meaning in English

start, beginning, commencement

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What it means

What does 開始 mean? It denotes the moment or act of beginning something—a formal or natural onset of a process, event, or activity. In everyday and formal Japanese, it marks the point at which preparation ends and action begins, often used with verbs like する to express the act of starting.

Main meanings

  • Start or commencement of something such as a project, event, or program
  • The opening phase or onset of a process or sequence
  • A defined starting time or date, especially in schedules or announcements

How to use it

Used in formal, written, and spoken contexts to refer to the initiation of a plan, event, or process. It often appears with compounds like 開始する to express the act of starting, and with time-related terms such as 開始時刻 or 開始日 to designate the starting point in schedules, contracts, and announcements.

Variants and close terms

  • 始動 (shidō) – start-up, initiating operation
  • スタート (sutāto) – start, loanword
  • 始まり (hajimari) – beginning, noun
  • 着手 (chakushu) – to commence, to begin work
  • 終わる/終了 (shūryō) – end, antonym

Composition

  • 開 = open, to open
  • 始 = begin, start
  • Together they form a compound meaning the act or moment of beginning something

Etymology

開 (open) + 始 (begin) form a Sino-Japanese compound read kaishi; the on'yomi readings kai and shi combine to convey the sense of initiating something.

Word class

Noun (suru-verb) (名詞, する動詞)

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