rebate

Etymology

From Old French rabatre < batre. See also abate.

noun

1. A deduction from an amount that is paid; an abatement.
2. The return of part of an amount already paid.
3. (photography) The edge of a roll of film, from which no image can be developed.
4. A rectangular groove made to hold two pieces (of wood etc) together; a rabbet.
   For your existing windows, the glazing rebates will also have to be deepened to provide the extra gap. 11 September 2014, Jeff Howell, “Home improvements: The dangers of abestos roofs [print version: Where can I find help – at the double?, 6 September 2014, p. P13]”, in The Daily Telegraph (Property)
5. A piece of wood hafted into a long stick, and serving to beat out mortar.
6. An iron tool sharpened something like a chisel, and used for dressing and polishing wood.
7. A kind of hard freestone used in making pavements.

verb

1. (transitive) To deduct or return an amount from a bill or payment
2. (transitive) To diminish or lessen something
3. To beat to obtuseness; to deprive of keenness; to blunt; to turn back the point of, as a lance used for exercise.
   Then near the corslet, at the monarch’s heart, With all his strength, the youth directs his dart: But the broad belt, with plates of silver bound, 1715, Homer, Iliad, translated by Alexander Pope, Book XI
4. (transitive) To cut a rebate (or rabbet) in something
5. To abate; to withdraw.
6. (intransitive, falconry) Of a falcon: to return to the hand after bating; see bate².
   The ſecunde is rebate youre hawke: to yowre fyſt, ⁊ thatt is whan yowre hawke batith, the leeſt meuyng that ye can make with yowre fyſt ſhe will rebate ayen vppon yowre fyſt[.] 1486, Juliana Berners, Book of Saint Albans