noun
Refers to the state of being fully ripe, especially for fruit. Also used figuratively for maturity or peak condition.
この桃は熟れが足りない。
This peach isn't ripe enough.
彼の演技には熟れが見られる。
His performance shows maturity.
The noun form of the verb 熟れる (うれる, 'to ripen'). The kanji 熟 carries the meaning of 'ripen' or 'mature'.