The Collaborative International Dictionary of English v.0.48:

Comparable \Com"pa*ra*ble\, a. [L. comparabilis: cf. F.
   comparable.]
   Capable of being compared; worthy of comparison.
   [1913 Webster]

         There is no blessing of life comparable to the
         enjoyment of a discreet and virtuous friend. --Addison.
   -- Com"pa*ra*ble*ness, n. -- Com"pa*ra*bly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

comparable
    adj 1: able to be compared or worthy of comparison [ant:
           incomparable, uncomparable]
    2: conforming in every respect; "boxes with corresponding
       dimensions"; "the like period of the preceding year" [syn:
       comparable, corresponding, like]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "comparable":
   affinitive, agnate, akin, alike, analogical, analogous,
   appertaining, approximate, approximating, approximative,
   associative, close, collatable, commensurable, commensurate,
   comparative, congenial, connective, consonant, correlative,
   correspondent, corresponding, duplicate, en rapport, equivalent,
   homologous, like, linking, matchable, matching, much at one, near,
   of a kind, of a piece, of a size, parallel, paralleling,
   pertaining, pertinent, proportionable, proportional, proportionate,
   proximate, referable, referring, relatable, relating, relational,
   relative, similar, sympathetic, twin, undifferenced, uniform