/ məˈtʃʊərəti; -ˈtjʊə-; NAmE -ˈtʃʊr-; -ˈtʊr-/ noun [ U ]
1.
the quality of thinking and behaving in a sensible, adult manner :
He has maturity beyond his years.
Her poems show great maturity.
—compare immaturity
2.
( of a person, an animal, or a plant ) the state of being fully grown or developed :
The forest will take 100 years to reach maturity .
—compare immaturity
3.
( business ) ( of an insurance policy, etc. ) the time when money you have invested is ready to be paid
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WORD ORIGIN
late Middle English : from Latin maturitas , from maturus timely, ripe.