Source : Webster's Revised Unabridged Dictionary (1913)

Applicability \Ap`pli*ca*bil"i*ty\, n.
   The quality of being applicable or fit to be applied.

Source : WordNet®

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