Source : Webster's Revised Unabridged Dictionary (1913)

Denotation \De`no*ta"tion\, n. [L. denotatio: cf. F.
   d['e]notation.]
   The marking off or separation of anything. --Hammond.

Source : WordNet®

denotation
     n 1: the act of indicating or pointing out by name [syn: {indication}]
     2: the most direct or specific meaning of a word or expression;
        the class of objects that an expression refers to; "the
        extension of `satellite of Mars' is the set containing
        only Demos and Phobos" [syn: {reference}, {extension}]