deduct

deduct (http://definr.com/deduct)

     v 1: make a subtraction [syn: subtract, take off] [ant: add]
     2: retain and refrain from disbursing; of payments; "My
        employer is withholding taxes" [syn: withhold, recoup]
     3: reason by deduction; establish by deduction [syn: deduce,
        infer, derive]