Definitions from Wiktionary ( )

▸ noun:  Sameness, identicalness; the quality or fact of (several specified things) being the same.
▸ noun:  The difference or character that marks off an individual or collective from the rest of the same kind; selfhood; the sense of who something or someone or oneself is, or the recurring characteristics that enable the recognition of such an individual or group by others or themselves.
▸ noun:  A name or persona—a mask or appearance one presents to the world—by which one is known.
▸ noun:  (mathematics) An equation which always holds true regardless of the choice of input variables.
▸ noun:  (algebra, computing) Any function which maps all elements of its domain to themselves.
▸ noun:  (algebra) An element of an algebraic structure which, when applied to another element under an operation in that structure, yields this second element.
▸ noun:  (Australia, New Zealand) A well-known or famous person.

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