The Meaning of kairyō [改良] In Japanese

改良
かいりょう
Romaji: kairyō N4

What does 改良 mean?

Translation and Meaning

improvement, refinement, to improve

Definition

Improvement or refinement achieved through modification or optimization; it refers to making something better by altering its design, process, or function, especially in technical, industrial, or research contexts.

Type

Noun (名詞); also forms 改良する (to improve) as a suru-verb

Stroke Order

Meanings

  • In engineering or product development, 改良 denotes systematic enhancements aimed at performance, durability, or usability.
  • In scientific or research contexts, it refers to iterative improvements of methods or experimental systems.
  • As 改良する it means to improve or to refine, typically by redesign or optimization.

Etymology

etimologia: The kanji 改 means change or revise, and 良 means good; together they form a compound meaning a change that yields a better state. The standard on’yomi reading is kairyō, which solidifies as the common pronunciation of the compound.

Composition

  • 改: change, modify; alter
  • 良: good, favorable; quality
  • Together they denote making something better by changing it for the good

Usage

Used in formal technical writing, manufacturing, and research to describe deliberate enhancements; Example: 技術開発では新製品の機能を改良する。研究プロセスの改良を進める。農業分野で品種改良が行われる。
💡 Tips
Mnemonic: imagine a gear labeled 改 turning to reveal a shining 良; the gear turning represents changing something to become better—so 改良 is literally a ‘change for the good’.

Variations

  • 改善 (kaizen) — improvement
  • 向上 (kōjō) — enhancement
  • 進化 (shinka) — evolution, refinement
  • 悪化 (akka) — deterioration

Example Phrases

  • 新しい アプリ を 改良 して 使い勝手 が よく なった
    Atarashii apuri o kairyō shite tsukaigatte ga yoku natta
    I improved the new app to make it easier to use.
    Lista:
    • 新しい (atarashii) – new
    • アプリ (apuri) – app
    • を (wo) – object marker
    • 改良 (kairyō) – improvement
    • して (shite) – doing
    • 使い勝手 (tsukaigatte) – usability
    • が (ga) – subject marker
    • よく (yoku) – well
    • なった (natta) – became
    In this sentence, the word is 「改良」 meaning ‘improvement/refinement’; it is used with して to connect to the result clause 使い勝手がよくなった.
改良