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ideate to form a thought or idea of; imagine. [2 definitions]
idée fixe (French) a fixed idea or obsession.
idem (Latin) the same as that previously mentioned (used in footnotes and bibliographies to indicate that a citation comes from the same book, article, page, or the like as the previous citation).
identical the same. [3 definitions]
identical twin either of two twins formed from the splitting of one zygote, or fertilized egg, and sharing the same genotype at birth.
identification the act of identifying a person or thing. [3 definitions]
identify to determine or prove the identity of (someone or something). [4 definitions]
identity all of those characteristics by which a person or thing is known to be himself, herself, or itself. [3 definitions]
identity crisis a period of distress of confusion about one's role, goals, character, or the like, esp. occurring in adolescence, because of conflicting expectations from parents, peers, or the like. [2 definitions]
identity theft the crime of taking on the identity of another by discovering and appropriating identifying information such as social security and credit card numbers.
ideo- idea.
ideogram a written character or symbol that represents an object or idea without spelling out particular words. [2 definitions]
ideological of or concerning basic beliefs, concepts, and social and political aims of an individual, group, or institution; of or concerning ideology.
ideologist an expert in ideology.
ideologue one who strongly advocates a particular ideology.
ideology the body of beliefs, symbols, and political and social aims that characterizes a particular group or institution.
ideomotor in psychology, of or denoting an unconscious physical motion that is stimulated by an idea.
ides (used with a sing. or pl. verb) in the ancient Roman calendar, the fifteenth day of the months March, May, July, and October, and the thirteenth day of all other months.
Ides of March March 15 on the Roman calendar, on which Julius Caesar was assassinated in 44 B.C.
id est (Latin) that is; namely.
idiocy the state of being an idiot; an intelligence level very far below normal. [2 definitions]