a deep notch formed in or near one edge of a board, framing timber, etc., so that something else can be fitted into it or so that a door or the like can be closed against it.
2.
a broad groove let into the surface of a board or the like; dado.
verb (used with object)
3.
to cut a rabbet in (a board or the like).
4.
to join (boards or the like) by means of a rabbet or rabbets.
verb (used without object)
5.
to join by a rabbet (usually followed by on or over ).
1382 (implied in rabbeting), from O.Fr. rabbat "a recess in a wall," lit. "a beating down," from rabattre "beat down, beat back" (see rebate). The verb is attested from 1565.