noun
cleanliness level; degree of cleanliness
Technical term used in engineering, manufacturing, and environmental contexts to quantify how clean a surface, room, or substance is.
このクリーンルームの清浄度はクラス100です。
The cleanliness level of this cleanroom is Class 100.
製品の品質を保つために、製造工程の清浄度を定期的に測定している。
To maintain product quality, we regularly measure the cleanliness level of the manufacturing process.
清浄 means 'pure' or 'clean' as a state, often used in religious or formal contexts; 清浄度 adds the suffix 度 to express the measurable level of that purity.
Compound of 清浄 (seijō, 'pure, clean') and 度 (do, 'degree'). The exact historical derivation is uncertain, but the word follows a common pattern for forming technical measurement terms.