定常(ていじょう)

ていじょう
noun, na-adjective
steady; stable; stationary; constant
formalscience
1. steady; stable; stationary; constant
A state that remains unchanged over time, without fluctuation or variation. Often used in scientific and technical contexts to describe systems or processes in equilibrium.
定常(ていじょう)状態(じょうたい)に達(たっ)する。
To reach a steady state.
定常(ていじょう)的(てき)な運転(うんてん)を維持(いじ)する。
To maintain steady operation.
この装置(そうち)は定常(ていじょう)運転(うんてん)に入(はい)るまで数分(すうふん)かかる。
This equipment takes several minutes to enter steady-state operation.

Composed of 定(てい) (fixed, settled) and 常(じょう) (constant, usual). Used primarily as a modifier (with の or 的(てき)) to describe unchanging, stable conditions.

Common collocations

  • 定常(ていじょう)状態(じょうたい): steady state
  • 定常(ていじょう)運転(うんてん): steady-state operation
  • 定常(ていじょう)的(てき): steady, constant (adjectival form)
  • 定常(ていじょう)波(は): standing wave (physics)
  • 定常(ていじょう)流(りゅう): steady flow

Similar words

  • 安定(あんてい): stable — more common in everyday language, implies being firmly established
  • 一定(いってい): constant / fixed — emphasizes a set, unchanging level
  • 恒常(こうじょう): permanent / constant — emphasizes long-lasting, enduring constancy

Register

Technical and formal. Frequently used in science, engineering, and economics. In everyday speech, 安定(あんてい) or 一定(いってい) are more natural.

Related Words

Compare: 安定(あんてい) (stable)
Compare: 一定(いってい) (constant / fixed)
general
Added 2026.4.5 6:13 · Revised 2026.9.2 13:02
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