noun An alphabetical listing of items and their location.
The index of a book lists words or expressions and the pages of the book upon which they are to be found.
noun The index finger; the forefinger.
noun A movable finger on a gauge, scale, etc.
noun A symbol resembling a pointing hand, used to direct particular attention to a note or paragraph.
noun That which points out; that which shows, indicates, manifests, or discloses.
Among the gravity indexes is the severance of diplomatic relations.
noun A sign; an indication; a token.
noun A type of noun where the meaning of the form changes with respect to the context; e.g., 'Today's newspaper' is an indexical form since its referent will differ depending on the context. See also icon and symbol.
noun A single number calculated from an array of prices or of quantities.