こうこう
Meanings
Noun
Chemistry
1. age hardening; precipitation hardening; particle hardening
Kanji used
time
be effective
hard like a rock
transformation
Pitch accent
こうこ
うか
Composed of
statute of limitations; lapse of rights after a period of time; becoming invalid or void after a set time; ageing; aging
hardening; vulcanization; hardening (of attitude, stance, etc.); stiffening; upturn (in the market); firming up