改善
Meaning in Englishimprovement, betterment
Animated kanji stroke order
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Word context
What it means
The word 改善 (kaizen) means improvement: the act or process of making something better; it denotes purposeful changes intended to remove problems, raise quality, increase efficiency, or enhance conditions in a system, product, service, or behavior.
Main meanings
- Continuous incremental improvement as an ongoing philosophy applied to processes and work routines.
- A discrete corrective action taken to fix a specific defect or problem.
- An organized quality-improvement project or initiative within a company or team.
- Personal development or self-improvement efforts, from habits to skills.
- Metric-driven improvement, referring to measurable gains (e.g., higher performance, lower error rates).
How to use it
Common in business, manufacturing, quality control, healthcare, software development and everyday speech to describe making things better; used both as a noun and as a verbal phrase with 改善する (kaizen suru) to mean 'to improve'; appears in formal reports, training, shop-floor kaizen activities, and casual comments about fixing or upgrading something.
Variants and close terms
- 改良 (kairyou) — improvement, often of an object or product.
- 向上 (koujou) — rise, enhancement, improvement in ability or status.
- 改善策 (kaizen-saku) — improvement measure/plan.
- 改革 (kaikaku) — reform, larger structural change (antonym in scale).
- 悪化 (akka) — deterioration, worsening (antonym).
Composition
- 改 (kai): change, revise — indicates altering or correcting.
- 善 (zen): good, virtuous — denotes goodness or betterment.
- Combined, the characters express the idea of 'changing toward good' or making something better, which yields the modern sense of improvement.
Origin
The compound comes from Sino-Japanese vocabulary but gained distinctive social prominence in 20th-century Japan when manufacturing and management practices emphasized small, continuous improvements; it became globally known through Toyota and the development of Lean/quality management methods and later spread into healthcare, software, and service industries.
Word class
noun (also a suru-verb / 名詞・サ変動詞)