1530s, "indication, act of indicating by a name or sign," from Late Latin denotationem (nominative denotatio), noun of action from past-participle stem of Latin denotare "denote, mark out," from de- "completely" (see de-) + notare "to mark, note, make a note" (see note (v.)). Sense of "meaning or signification of a term" is from 1610s. As a term in logic, "that which a word denotes, names, or marks" (contrasted with connotation) from 1843. Related: Denotational.