The Collaborative International Dictionary of English v.0.48:

Denomination \De*nom`i*na"tion\, n. [L. denominatio metonymy:
   cf. F. d['e]nomination a naming.]
   1. The act of naming or designating.
      [1913 Webster]

   2. That by which anything is denominated or styled; an
      epithet; a name, designation, or title; especially, a
      general name indicating a class of like individuals; a
      category; as, the denomination of units, or of thousands,
      or of fourths, or of shillings, or of tons.
      [1913 Webster]

            Those [qualities] which are classed under the
            denomination of sublime.              --Burke.
      [1913 Webster]

   3. A class, or society of individuals, called by the same
      name; a sect; as, a denomination of Christians.

   Syn: Name; appellation; title. See Name.
        [1913 Webster]

WordNet (r) 3.0 (2006):

denomination
    n 1: a group of religious congregations having its own
         organization and a distinctive faith
    2: a class of one kind of unit in a system of numbers or
       measures or weights or money; "he flashed a fistful of bills
       of large denominations"
    3: identifying word or words by which someone or something is
       called and classified or distinguished from others [syn:
       appellation, denomination, designation, appellative]