The Collaborative International Dictionary of English v.0.48:

Pertinence \Per"ti*nence\, Pertinency \Per"ti*nen*cy\, n. [Cf.
   F. pertinence. See Pertinent.]
   The quality or state of being pertinent; justness of relation
   to the subject or matter in hand; fitness; appositeness;
   relevancy; suitableness.
   [1913 Webster]

         The fitness and pertinency of the apostle's discourse.
                                                  --Bentley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pertinency
    n 1: relevance by virtue of being applicable to the matter at
         hand [syn: applicability, pertinence, pertinency]
         [ant: inapplicability]