Adult Definition
 ə-dŭlt, ădŭlt 
  adults
  
    noun
  
 
    adults
  
A man or woman who is fully mature; grown-up.
 Webster's New World 
An animal or plant that is fully developed.
 Webster's New World 
A person who has reached the age of majority, now generally 18 years.
 Webster's New World 
One who has attained maturity or legal age.
 American Heritage Medicine 
A fully grown, mature organism.
 American Heritage Medicine 
Synonyms: 
 Antonyms: 
 
    adjective
  
 Mature in age, size, strength, etc.; grown-up.
 Webster's New World 
Of or for adult persons.
 An adult novel.
 Webster's New World 
Containing or dealing in explicitly sexual material; pornographic.
 Adult movies.
 American Heritage 
Containing or providing sexually explicit or, esp., pornographic material.
 Adult movies.
 Webster's New World 
Fully developed and mature.
 American Heritage Medicine 
Synonyms: 
 Antonyms: 
 Other Word Forms of Adult
Noun
Singular:
 adultPlural:
 adultsOrigin of Adult
-  
French adulte, Latin adultus (“grown up”), perfect passive participle of adolescō (“I grow up”). Compare adolescent.
From Wiktionary
 -  
From Latin adultus past participle of adolēscere to grow up adolescent
From American Heritage Dictionary of the English Language, 5th Edition
 
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