noun
statute of limitations; prescription; lapse of rights after a period of time
Legal term for the expiration of a right or claim after a statutory period. Covers both extinctive and acquisitive prescription.
この事件は時効が成立した。
The statute of limitations has run out on this case.
時効によっ
His debt was extinguished by prescription.
noun
becoming invalid or void after a set time
General, non-legal use for something losing validity or effect after a certain period, such as a coupon, warranty, or informal promise.
このクーポンはもう時効だよ。
This coupon has already expired.
彼の約束はとっくに時効だ。
His promise is long past its expiration date.
noun
Chemistry term, mainly in compounds like 時効硬化 (age hardening). Rarely used alone.
See also: 時効硬化
時効硬化は金属の強度を高める。
Age hardening increases the strength of metals.