adult adult /ˈædʌlt/

adjective

1. () (of animals) fully developed  ( big , fully grown , grownup , adult , full-grown , grown )
   (of animals) fully developed
    An adult animal
   an adult animal
    A grown woman
   a grown woman
   
2. Designed to arouse lust  ( adult , pornographic , porny [Vulgar] )
   designed to arouse lust
    Pornographic films and magazines
   pornographic films and magazines
    Adult movies
   adult movies
   

noun

1. () Any mature animal  ( adult )
   any mature animal
     The adult lion roamed the grassy savannah with confidence and authority.
   The adult lion roamed the grassy savannah with confidence and authority.
   
   
2. () A fully developed person from maturity onward  ( grownup , adult )
   a fully developed person from maturity onward
    As an adult, it's important to take responsibility for your actions
   As an adult, it's important to take responsibility for your actions