slot

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A narrow opening; a groove or slit.
• noun A gap between a main and auxiliary airfoil to provide space for airflow and facilitate the smooth passage of air over the wing.
• noun An assigned place in a sequence or schedule.
• noun A position of employment in an organization or hierarchy.
• noun Computers An expansion slot.
• noun Informal A slot machine designed for gambling.
• noun Football A space or gap between an end and a tackle in an offensive line.
• noun Sports An unmarked area in front of the goal between the face-off circles on an ice hockey rink.
• transitive verb To cut or make a slot or slots in.
• transitive verb To put into or assign to a slot.
• noun The track or trail of a deer.

from The Century Dictionary.

• noun A hollow.
• noun In machinery, an elongated narrow depression or perforation; a rectangular recess or depression cut partially into the thickness of any piece, for the reception of another piece of similar form, as a key-seat in the eye of a wheel or pulley; an oblong hole or aperture formed throughout the entire thickness of a piece of metal, as for the reception of an adjusting-bolt. See cut under sheep-shears.
• noun In a cable street-railroad, a narrow continuous opening between the rails, through which the grip on the car passes to connect with the traveling cable.
• noun A trapdoor in the stage of a theater.
• noun A hollow tuck in a cap, or other part of the dress.
• noun A hem or casing prepared for receiving a string, as at the mouth of a bag.
• noun The track of a deer, as followed by the scent or by the mark of the foot; any such track, trace, or trail.
• noun The fastening of a door; a bar; a bolt.
• noun A piece of timber which connects or holds together larger pieces; a slat.
• noun A small piece.
• noun A castle; a fort.
• To slit; cut; gash.
• To provide with a slot or groove; hollow out.
• In coal-mining, same as hole, 3 .
• To track by the slot, as deer. Compare slothound.
• To shut with violence; slam.

from the GNU version of the Collaborative International Dictionary of English.

• noun A broad, flat, wooden bar; a slat or sloat.
• noun Prov. Eng. A bolt or bar for fastening a door.
• noun A narrow depression, perforation, or aperture; esp., one for the reception of a piece fitting or sliding in it.
• noun The track of a deer; hence, a track of any kind.
• transitive verb Obs. or Prov. Eng. To shut with violence; to slam.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A broad, flat, wooden bar, a slat, especially as used to secure a door, window, etc.
• noun A metal bolt or wooden bar, especially as a crosspiece.
• noun electrical A channel opening in the stator or rotor of a rotating machine for ventilation and insertion of windings.
• noun slang, surfing surfing term for the barrel or tube of a wave.
• verb obsolete To bolt or lock a door or window.
• noun A narrow depression, perforation, or aperture; especially, one for the reception of a piece fitting or sliding in it.
• noun A gap in a schedule or sequence.
• noun aviation The allocated time for an aircraft's departure or arrival at an airport's runway.
• noun aviation In a flying display, the fourth position; after the leader and two wingmen.
• noun computing A space in memory or on disk etc. in which a particular type of object can be stored.
• noun informal A slot machine designed for gambling.
• noun slang The vagina.
• verb To put something (such as a coin) into a slot (narrow aperture)
• verb To assign something or someone into a slot (gap in a schedule or sequence)
• verb To put something where it belongs.
• noun The track of an animal, especially a deer.