noun
Used to describe the degree or extent of something, often in abstract or measurable contexts. Common in both formal and everyday language.
被害の度合いはまだ分からない。
The extent of the damage is still unknown.
練習の度合いによって上達の速さが変わる。
The speed of improvement varies depending on the amount of practice.
Compound of 度 (do, 'degree') and 合い (ai, 'togetherness' or 'matching'), literally 'degree-matching'. The exact historical derivation is uncertain, but the word has been used since at least the Edo period to express extent or degree.