Source : Webster's Revised Unabridged Dictionary (1913)

Relevance \Rel"e*vance\ (r?l"?*vans), Relevancy \Rel"e*van*cy\
   (-van*s?), n.
   1. The quality or state of being relevant; pertinency;
      applicability.

            Its answer little meaning, little relevancy bore.
                                                  --Poe.

   2. (Scots Law) Sufficiency to infer the conclusion.

Source : WordNet®

relevancy
     n : the relation of something to the matter at hand [syn: {relevance}]
         [ant: {irrelevance}]