The Collaborative International Dictionary of English v.0.48:

Applicable \Ap"pli*ca*ble\, a. [Cf. F. aplicable, fr. L.
   applicare. See Apply.]
   Capable of being applied; fit or suitable to be applied;
   having relevance; as, this observation is applicable to the
   case under consideration. -- Ap"pli*ca*ble*ness, n. --
   Ap"pli*ca*bly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

applicable
    adj 1: capable of being applied; having relevance; "gave
           applicable examples to support her argument"

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "applicable":
   a propos, actionable, ad rem, adapted, admissible, appertaining,
   appliable, applying, apposite, appropriate, apropos, apt,
   authorized, becoming, befitting, belonging, compatible, competent,
   compliant, congenial, connective, constitutional, correct,
   dovetailing, exploitable, felicitous, fit, fitted, fitting, geared,
   germane, good, happy, in point, involving, judicial, juridical,
   just, just right, justiciable, kosher, lawful, lawmaking, legal,
   legislative, legit, legitimate, licit, likely, manipulable,
   material, meet, meshing, on the button, operable, opportune, pat,
   pertaining, pertinent, pliable, practical, proper, qualified,
   relevant, reusable, right, rightful, sanctioned, seasonable,
   seemly, sortable, statutory, suitable, suited, suiting, tailored,
   to the point, to the purpose, usable, utilizable, valid,
   within the law