Biologically, an adult is a human or other organism that has reached sexual maturity. In human context, the term adult additionally has meanings associated with social and legal concepts. In contrast to a "minor", a legal adult is a person who has attained the age of majority and is therefore regarded as independent, self-sufficient, and.
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Adult ADHD symptoms can differ from those of children because of the relative maturity of adults, as well as physical differences between adults and children. Learn more: 12 Signs of adult ADHD» Author: Tricia Kinman.
Define adult. adult synonyms, adult pronunciation, adult translation, English dictionary definition of adult. n. 1. One who has attained maturity or legal age. 2. Biology A fully grown, mature organism. adj. 1. but in all cases natural selection will ensure that modifications consequent on other modifications at a different period of life.