The Collaborative International Dictionary of English v.0.48:

Transparence \Trans*par"ence\, n. [Cf. F. transparence.]
   The quality or state of being transparent; transparency.
   [1913 Webster]

WordNet (r) 3.0 (2006):

transparence
    n 1: permitting the free passage of electromagnetic radiation
         [syn: transparency, transparence] [ant: opacity]
    2: the quality of being clear and transparent [syn:
       transparency, transparence, transparentness]