There are 21 meanings listed in oed's entry for the word mature, three of which are labelled obsolete. See ‘meaning & use’ for definitions, usage, and quotation evidence. Definition of mature adjective in oxford advanced learner's dictionary.

If you describe someone as mature, you think that they are fully developed and balanced in their personality and emotional behaviour. Mature people behave like adults in a way that shows they are well developed emotionally: Learn more. Anything that is fully developed, like an aged cheese or bottle of wine, can also be called mature. The word can also refer to something that is only appropriate for people who are considered legal adults, … The meaning of mature is having completed natural growth and development : How to use mature in a sentence.

The word can also refer to something that is only appropriate for people who are considered legal adults, … The meaning of mature is having completed natural growth and development : How to use mature in a sentence. Complete in natural growth or development, as plant and animal forms. See examples of mature used in a sentence.