Mature wifes in threesome orgies. His parents didn't think he was mature enough to live on his own. a. 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. com. Anything that is fully developed, like an aged cheese or bottle of wine, can also be called mature. Examples of mature in a Sentence Adjective She's very mature for her age. complete in natural growth or development: mature plants. See ‘Meaning & use’ for definitions, usage, and quotation evidence. fully developed in body or mind. mg05eg2opzwvhcprkhvsiatdfvjmgtigpaszyng0oc6yvusryvhril