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A person who by virtue of attaining a certain age, generally eighteen, is regarded in the eyes of the law as being able to manage his or her own affairs.

The age specified by law, called the legal age of majority, indicates that a person acquires full legal capacity to be bound by various documents, such as contracts and deeds, that he or she makes with others and to commit other legal acts such as voting in elections and entering marriage. The age at which a person becomes an adult varies from state to state and often varies within a state, depending upon the nature of the action taken by the person. Thus, a person wishing to obtain a license to operate a motor vehicle may be considered an adult at age sixteen, but may not reach adulthood until age eighteen for purposes of marriage, or age twenty-one for purposes of purchasing intoxicating liquors.

Anyone who has not reached the age of adulthood is legally considered an infant.


noun adultus, elder, fully developed person, fully grown person, grown-up person, mature person, one who has attained legal majority, person of age, person of voting age, pubes, senior
Associated concepts: adult male, adult person, adult woman, age of majority
See also: ripe


a person who has attained the age of legal majority.

ADULT, in the civil law. An infant who, if a boy, has attained his full age of fourteen years, and if a girl, her full age of twelve. Domat, Liv. Prel. t. 2, s. 2, n. 8. In the common law an adult is considered one of full age. 1 Swanst. R. 553.

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Norristown, PA, has been awarded a 3-year, $2 million grant from the National Institute of Standards and Technology's Advanced Technology Program (NIST-ATP) to develop novel techniques for site-specific insertion and control of therapeutic genes in human adult neural stem cells to treat incurable ocular diseases.
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125115- "(a) That research involving the derivation and use of human embryonic stem cells, human embryonic germ cells, and human adult stem cells from any source, including somatic cell transfer transplantation, shall be permitted and that full consideration of the ethical and medical implications of this research be given.
We have access to several human adult stem cell lines, and we've demonstrated the capacity of these stem cell lines for differentiation into functional beta cells.
In situ characterization of the mTORC1 during adipogenesis of human adult stem cells on chip," Proceedings of the National Academy of Sciences, 2016; 201601207 DOI: 10.
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Evaluating the potential of cardionogen on human adult and embryonic stem cells is the next logical step," Zhong, senior author of the study, said.

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