noun The act of denoting, or something (such as a symbol) that denotes
noun The primary, surface, literal, or explicit meaning of a signifier such as a word, phrase, or symbol; that which a word denotes, as contrasted with its connotation; the aggregate or set of objects of which a word may be predicated.
The denotations of the two expressions "the morning star" and "the evening star" are the same (i.e. both expressions denote the planet Venus), but their connotations are different.
noun The intension and extension of a word
noun Something signified or referred to; a particular meaning of a symbol
noun Any mathematical object which describes the meanings of expressions from the languages, formalized in the theory of denotational semantics
noun A first level of analysis: what the audience can visually see on a page. Denotation often refers to something literal, and avoids being a metaphor.