1. 成熟;长大成人
    Maturity is the state of being fully developed or adult.

    e.g. Humans experience a delayed maturity; we arrive at all stages of life later than other mammals.
           人类发育较缓——在生命的各个阶段，我们都晚于其他哺乳动物。

2. (性格、行为等的)成熟
    Someone's maturity is their quality of being fully developed in their personality and emotional behaviour.

    e.g. Her speech showed great maturity and humanity...
           她的演讲非常老练，极富人情味。
    e.g. Lacking self-confidence and maturity, many teenagers are left feeling very vulnerable.
           许多十几岁的孩子既缺乏自信又不够懂事，所以感情上十分脆弱。

3. (存单、养老金计划等的)到期
    When an investment such as a savings policy or pension plan reaches maturity, it reaches the stage when you stop paying money and the company pays you back the money you have saved, and the interest your money has earned.

    e.g. Customers are told what their policies will be worth on maturity...
           客户被告知保险单到期时的价值。
    e.g. Treasury bonds have maturities that extend out as far as 25 years or more.
           国库券的到期时间长达25年甚至更久。