To end, eliminate, do away with, or make null and void. 2 v. To diminish, decrease, or lessen in degree or amount. 3 n. The reduction of a bequest or devise made in a will because the combined value of all bequests and devises, and/or the debts owed by a testator, exceed the assets in the testator's estate. 4n. The rebate or reduction of taxes already assessed and/or paid