What does "maturity" mean in terms of a lady's nature?

This question is for all the ladies and gents out there. What do you people mean when someone says that a lady is mature not physically but otherwise? What is the meaning of maturity, specifically in women? Does maturity mean being practical in life? How can a mature lady make or break a relationship? Is it good to be overly mature? All the inputs would be highly appreciated. Thanks to all.