Word
Kana: ていき Romaji: teiki Level: N3

定期

Meaning in English

fixed term, regular period, commuter pass

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Word context

What it means

定期 means regular or fixed in time, indicating events that recur at set intervals, and it also refers to a subscription or pass that lasts for a defined period.

Main meanings

  • regular or recurring at fixed intervals, often used in the sense of a routine or schedule
  • a fixed term or fixed period, such as within a timetable or calendar
  • a subscription or commuter pass when used in compounds like 定期券

How to use it

Used in formal and everyday language to describe schedules, periodic payments, and recurring checks; functions as a noun and appears in compounds such as 定期的, 定期券, and 定期検査; typically occurs in written instructions, schedules, or forms.

Variants and close terms

  • 定常 (ていじょう, teijou) — steady, constant
  • 規則的 (きそくてき, kisokuteki) — regular, systematic
  • 不定期 (ふていき, futeiki) — irregular
  • 定期券 (ていきけん, teikiken) — commuter pass

Composition

  • 定: fix, establish; used here to indicate a fixed state or condition
  • 期: term, period; denotes a set time or deadline
  • combined meaning: a fixed term or a scheduled interval

Etymology

Borrowed from Chinese, combining on'yomi readings 定 (tei) and 期 (ki) to form teiki; the pronunciation and sense reflect Sino-Japanese compound formation that expresses a fixed time concept.

Origin

The concept appeared in Japanese with the adoption of Chinese characters; modern sense of regularity and scheduled services solidified during the Meiji period through administrative and commercial language.

Word class

noun (名詞)

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