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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. One who has attained maturity or legal age.
  2. n. Biology A fully grown, mature organism.
  3. adj. Fully developed and mature.
  4. adj. Relating to, intended for, or befitting adults: adult education.
  5. adj. Containing or dealing in explicitly sexual material; pornographic: adult movies; adult bookstores.

Century Dictionary and Cyclopedia

  1. Having arrived at mature years, or attained full size and strength: as, an adult person, animal, or plant.
  2. Pertaining or relating to adults; suitable for an adult: as, adult age; an adult school.
  3. n. A person or (sometimes) an animal grown to full size and strength; one who has reached the age of manhood or womanhood.
  4. n. Specifically: In civil law, a male infant who has attained the age of fourteen, or a female infant who has attained the age of twelve.
  5. n. In common law, one of the full age of twenty-one.

Wiktionary

  1. n. A fully grown human or animal.
  2. n. A person who lives outside the parental home.
  3. n. A person whose parents are deceased.
  4. adj. Of a human or animal, fully grown.
  5. adj. Intended for adults rather than children.
  6. adj. Containing material or concerning subjects unsuitable (especially sexually) for children

GNU Webster's 1913

  1. adj. Having arrived at maturity, or to full size and strength; matured.
  2. n. A person, animal, or plant grown to full size and strength; one who has reached maturity.

WordNet 3.0

  1. n. a fully developed person from maturity onward
  2. n. any mature animal
  3. adj. designed to arouse lust
  4. adj. (of animals) fully developed

Etymologies

  1. From Latin adultus, past participle of adolēscere, to grow up; see adolescent.

Examples

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‘adult’ has been looked up 2769 times, added to 16 lists, commented on 2 times, and has a Scrabble score of 6.