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]