- 1the quality of thinking and behaving in a sensible, adult manner He has maturity beyond his years. Her poems show great maturity.
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- 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.
- 3(business) (of an insurance policy, etc.) the time when money you have invested is ready to be paid
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