Word
Kana: かいりょう Romaji: kairyou Level: N1

改良

Meaning in English

improvement, reform

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Dictionary

Word context

What it means

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.

Main 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.

How to use it

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。

Variants and close terms

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

Composition

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

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.

Word class

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

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