the quality of behaving in a sensible way like an adult [≠ immaturity]:
Beth shows a maturity way beyond her 16 years.
One day you'll have the maturity to understand.
the time or state when someone or something is fully grown or developed
The tree will reach only 5 feet at maturity.
the era when the Republic came to political maturity
He lacks the emotional maturity to appreciate poetry.
the time when a financial arrangement such as a bond or an insurance policy becomes ready to be paid