n. child during the earliest period of its life; a young child. See infancy.n. In law, a person who is not of full age; specifically (in Great Britain, the United States, etc.), one who has not attained the age of twenty-one years.n. A noble youth. See child, n., 8.Of, pertaining to, characterized by, or characteristic of infancy; hence, tender; infantile; incipient: as, infant beauty; infant fortunes.Of or pertaining to the legal state of infancy; minor.Figuratively, not yet fully grown; still in an early stage of development or growth: as, infant colonies; an infant bud.To bring forth as an infant; hence, to give origin or rise to.n. A royal prince or princess of Spain or Portugal: as, the Infant Don Philip: not necessarily the heir to the throne. See infante, infanta.