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):

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

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "pertinence":
   affective meaning, applicability, application, appositeness,
   bearing, coloring, concern, concernment, connection, connotation,
   consequence, denotation, drift, effect, essence, extension, force,
   germaneness, gist, grammatical meaning, idea, impact, implication,
   import, intension, interest, lexical meaning, literal meaning,
   materiality, meaning, overtone, pith, point, practical consequence,
   purport, range of meaning, real meaning, reference, referent,
   regard, relatedness, relation, relevance, respect, scope,
   semantic cluster, semantic field, sense, significance,
   signification, significatum, signifie, span of meaning, spirit,
   structural meaning, substance, sum, sum and substance,
   symbolic meaning, tenor, totality of associations,
   transferred meaning, unadorned meaning, undertone, value