The Collaborative International Dictionary of English v.0.48:

Commensurate \Com*men"su*rate\, v. t. [imp. & p. p.
   Commensurated; p. pr. & vb. n. Commensurating.] [Pref.
   com- + mensurate.]
   1. To reduce to a common measure. --Sir T. Browne.
      [1913 Webster]

   2. To proportionate; to adjust. --T. Puller
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Commensurate \Com*men"su*rate\, a.
   1. Having a common measure; commensurable; reducible to a
      common measure; as, commensurate quantities.
      [1913 Webster]

   2. Equal in measure or extent; proportionate.
      [1913 Webster]

            Those who are persuaded that they shall continue
            forever, can not choose but aspire after a happiness
            commensurate to their duration.       --Tillotson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

commensurate
    adj 1: corresponding in size or degree or extent; "pay should be
           commensurate with the time worked" [ant:
           incommensurate]

Moby Thesaurus II by Grady Ward, 1.0:

112 Moby Thesaurus words for "commensurate":
   accordant, adequate, affirmative, agreeable, agreeing, alike,
   ample, analogical, analogous, answerable, at one, at par, au pair,
   barely sufficient, coexistent, coexisting, coherent, coincident,
   coinciding, collatable, commensurable, comparable, comparative,
   compatible, competent, concordant, concurring, conformable,
   congenial, congruent, congruous, consentaneous, consentient,
   consistent, consonant, cooperating, cooperative, correlative,
   correspondent, corresponding, decent, drawn, due, en rapport,
   enough, equal, equal to, equalized, equivalent, even, even stephen,
   fifty-fifty, fit, good, good enough, half-and-half, harmonious,
   in accord, in agreement, in rapport, in sync, in synchronization,
   inaccordance, inharmony, knotted, level, like, like-minded,
   matchable, minimal, minimum, much at one, nip and tuck, of a piece,
   of like mind, of one mind, on a footing, on a level, on a par,
   on all fours, on even ground, par, parallel, plenty,
   plenty good enough, positive, proportionable, proportionate, quits,
   reconcilable, relative, satisfactory, satisfying, self-consistent,
   similar, square, stalemated, substantial, sufficient,
   sufficient for, sufficing, suitable, symbiotic, symmetrical,
   synchronized, synchronous, tied, unanimous, uniform, unisonant,
   unisonous, up to