UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈædʌlt/, /əˈdʌlt/

US:USA pronuncation: IPAUSA pronuncation: IPA/əˈdʌlt, ˈædʌlt/

US:USA pronunciation: respellingUSA pronunciation: respelling(ə dult, adult)

WordReference Random House Learner's Dictionary of American English © 2020
a•dult /əˈdʌlt, ˈædʌlt/USA pronunciation   n. [countable]
  1. Developmental Biologya person who is fully grown, developed, or of age:Only adults may purchase alcohol.

adj.  [usually: before a noun]
  1. Developmental Biologyhaving attained full size and strength;
    mature:adult plants.
  2. intended only for adults;
    not suitable for children:adult movies.
  3. of or like a fully grown, mature person:The teenager had a very adult expression on her face.
a•dult•hood, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2020
a•dult  (ə dult, adult),USA pronunciation adj. 
  1. having attained full size and strength;
    grown up;
    mature:an adult person, animal, or plant.
  2. of, pertaining to, or befitting adults.
  3. intended for adults;
    not suitable for children:adult entertainment.

  1. a person who is fully grown or developed or of age.
  2. a full-grown animal or plant.
  3. Lawmakinga person who has attained the age of maturity as specified by law.
a•dulthood, n. 
a•dultlike′, adj. 
a•dultly, adv. 
a•dultness, n. 
  • Latin adultus grown (past participle of adolēre to make grow), equivalent. to ad- ad- + ul- (identical with base al- in aliment, ol- in prolific) + -tus past participle suffix
  • 1525–35; 1925–30 for def. 3;

Collins Concise English Dictionary © HarperCollins Publishers::
adult /ˈædʌlt; əˈdʌlt/ adj
  1. having reached maturity; fully developed
  2. of or intended for mature people: adult education
  3. regarded as suitable only for adults, because of being pornographic
  1. a person who has attained maturity; a grownup
  2. a mature fully grown animal or plant
  3. a person who has attained the age of legal majority (18 years for most purposes)
Etymology: 16th Century: from Latin adultus, from adolēscere to grow up, from alēscere to grow, from alēre to feed, nourish

ˈadulthood n
'adult' also found in these entries (note: many are not synonyms or translations):
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