Source : Webster's Revised Unabridged Dictionary (1913)

Transparency \Trans*par"en*cy\, n.; pl. {Transparencies}. [Cf.
   F. transparence.]
   1. The quality or condition of being transparent;
      transparence.

   2. That which is transparent; especially, a picture painted
      on thin cloth or glass, or impressed on porcelain, or the
      like, to be viewed by natural or artificial light, which
      shines through it. --Fairholt.

Source : WordNet®

transparency
     n 1: permitting the free passage of electromagnetic radiation
          [syn: {transparence}] [ant: {opacity}]
     2: the quality of being clear and transparent [syn: {transparence},
         {transparentness}]
     3: picture consisting of a positive photograph or drawing on a
        transparent base; viewed with a projector [syn: {foil}]