v. To set going by taking the first step; begin: initiated trade with developing nations. See Synonyms at begin.v. To introduce to a new field, interest, skill, or activity.v. To admit into membership, as with ceremonies or ritual.adj. Initiated or admitted, as to membership or a position of authority.adj. Instructed in esoteric knowledge.adj. Introduced to something new.n. One who is being or has been initiated.n. One who has been introduced to or has attained knowledge in a particular field.