(of a child or young person) behaving in a sensible way, like an adult. Jane is very mature for her age. a mature and sensible attitude; She tries to look ...

to become fully grown or developed. This particular breed of cattle matures early. Technology in this field has matured considerably over the last decade.

mature · old having lived for a long time; no longer young:She's getting old—she'll be 75 next year. · elderly (somewhat formal) used as a polite word for “old”: ...

mature · ​. [intransitive] to become fully grown or developed · ​ · ​[intransitive] mature (into something) to fully develop a particular skill or quality · ​[ ...

There are 13 meanings listed in OED's entry for the verb mature, three of which are labelled obsolete. See 'Meaning & use' for definitions, usage, and ...

the quality of thinking and behaving in a sensible, adult manner. He has maturity beyond his years. Her poems show great maturity.

​the quality of thinking and behaving in a sensible, adult manner. He has maturity beyond his years. Her poems show great maturity.

mature adjective (DEVELOP MENTALLY). mentally and emotionally well-developed, and therefore responsible: He just wasn't mature enough to keep a dog.

Of a person or human faculty: the state of being physically and mentally mature; fullness or perfection of growth or development.

(British English) an adult student who goes to college or university some years after leaving school.