Slot \Slot\, n. [LG. & D. slot a lock, from a verb meaning to close., to shut, D. sluiten; akin to G. schliessen, OHG. sliozan, OFries. sl?ta, and probably to L. claudere. Cf. {Close}, {Sluice}.] 1. A broad, flat, wooden bar; a slat or sloat. [1913 Webster] 2. A bolt or bar for fastening a door. [Prov. Eng.] [1913 Webster] 3. A narrow depression, perforation, or aperture; esp., one for the reception of a piece fitting or sliding in it. [1913 Webster]