1.behaving in the sensible way that you would expect an adult to behave. This is usually used about children and young people; a mature adult is no longer young, and is considered to have the good qualities of an older person, for example the knowledge and experience of how to deal with particular situations; the mature work of an artist, writer, etc. is produced when they are no longer young and have developed their skill to a high level
2.a mature animal or plant has grown to its full size
3.mature cheese, wine, etc. has been left to develop a pleasant strong flavor
4.a mature garden contains plants that have grown to their full size and has been looked after for a long time
maturest