Definition of maturing:
(adj) :
Fully developed; grown up in terms of physical appearance, behaviour or thinking; ripe.
(adj) :
Brought to a state of complete readiness.
(v) :
(intransitive) To proceed toward maturity: full development or completion (either of concrete or of abstract things, e.g. plans, judgments, qualities).
(v) :
(intransitive, of a person) To proceed toward or become mature or full-grown, either physically or psychologically; to gain experience or wisdom with age.
(adj) :
Profound; careful.
(adj) :
(television, film) Suitable for adults only, due to sexual themes, violence, etc.