Of a person: of mature judgement or knowledge; fully informed; thoroughly qualified by study and thought. Frequently in ripe scholar. Now rare.

Of a person: Advanced (in age or knowledge). Obsolete.

Of a person: having attained the adult state of physical, mental, and emotional development; capable of a balanced judgement or response as a…

Chiefly in predicative use. Mature in attitude, outlook, behaviour, etc.; emotionally and mentally grown-up.