Source : Webster's Revised Unabridged Dictionary (1913)

Multiplicity \Mul`ti*plic"ity\, n. [Cf. F. multiplicit['e].]
   The quality of being multiple, manifold, or various; a state
   of being many; a multitude; as, a multiplicity of thoughts or
   objects. ``A multiplicity of goods.'' --South.

Source : WordNet®

multiplicity
     n 1: the property of being multiple
     2: a large number [syn: {numerousness}, {numerosity}]