Source : Webster's Revised Unabridged Dictionary (1913)

Compensative \Com*pen"sa*tive\, n.
   Compensation. [R.] --Lamb.

Compensative \Com*pen"sa*tive\, a. [LL. compensativus.]
   Affording compensation.

Source : WordNet®

compensative
     adj : compensating for [syn: {countervailing}, {offsetting}, {compensatory}]