adult

adj. mature, full grown

n. grown-up; mature person, mature animal

The term adult has three distinct meanings:Grown man or woman; mature person.Plant or animal that has reached full growth.One who is legally of age. Opposed to minor.Adulthood can be defined in terms of biology, psychological adult development, law, personal character, or social status. These different aspects of adulthood are often inconsistent and contradictory. A person may be biologically an adult, and have adult behavioral characteristics but still be treated as a child if they are under the legal age of majority. Conversely one may legally be an adult but possess none of the maturity and responsibility that define adult character.
See more at Wikipedia.org...

ADULT. is a band from Detroit, Michigan that integrates vocals with drum machines, analog synths and electronic/punk elements. While popular in their home city of Detroit, they are also very popular in Germany and the United Kingdom.
See more at Wikipedia.org...

Pornographic magazines, sometimes known as adult magazines, sex magazines, top-shelf magazines, or blue books are magazines that contain content of a sexual nature, typically regarded as pornography. Such publications provide photographs or other illustrations of nudity and sexual activities, including oral sex, sexual intercourse, anal sex, and other various forms of such activities. Most often, these magazines contain photographs of attractive women and/or men. These magazines primarily serve to stimulate sexual thoughts and emotions. Some magazines are very general in their variety of illustrations, while others may be more specific and focus on particular activities, fetishes, or parts of the anatomy. Adult magazines are mainly aimed towards men, as males populate the vast majority of the market.
See more at Wikipedia.org...

n. adult, mature person, grown-up

(n.)
A person, animal, or plant grown to full size and strength; one who has reached maturity.
  

(a.)
Having arrived at maturity, or to full size and strength; matured; as, an adult person or plant; an adult ape; an adult age.
  

noun & adjective
grown-up (person, animal); adolescents reach the adult stage about the age of eighteen or twenty