rebate

Short definition from Wiktionary

Noun

1. 1
   A deduction from an amount that is paid; an abatement.
2. 2
   The return of part of an amount already paid.
3. 3
   The edge of a roll of film, from which no image can be developed.
4. 4
   A rectangular groove made to hold two pieces (of wood etc) together; a rabbet.
5. 5
   A piece of wood hafted into a long stick, and serving to beat out mortar.
6. 6
   An iron tool sharpened something like a chisel, and used for dressing and polishing wood.
7. 7
   A kind of hard freestone used in making pavements.

Verb

1. 1
   To deduct or return an amount from a bill or payment
2. 2
   To diminish or lessen something
3. 3
   To beat to obtuseness; to deprive of keenness; to blunt; to turn back the point of, as a lance used for exercise.
4. 4
   To cut a rebate (or rabbet) in something
5. 5
   To abate; to withdraw.
6. 6
   Of a falcon: to return to the hand after bating; see bate².