Fully developed; grown up in terms of physical appearance, behaviour or thinking; ripe.
She is quite mature for her age.
Brought to a state of complete readiness.
a mature plan
Profound; careful.
The headmaster decided to expel the boy after a mature consideration.
Come to, or in a state of, completed suppuration.
Suitable for adults only, due to sexual themes, violence, etc.
mature content
One who brings to maturity.