1 [slot]
a narrow, elongated depression, groove, notch, slit, or aperture, especially a narrow opening for receiving or admitting something, as a coin or a letter.
a place or position, as in a sequence or series: The program received a new time slot on the broadcasting schedule.
Linguistics. (especially in tagmemics) a position having a specific grammatical function within a construction into which any one of a set of morphemes or morpheme sequences can be fit. Compare filler ( def 9 ).
an assignment or job opening; position: I applied for the slot in management training.
the interior opening in a copy desk, occupied by the chief copy editor.
the job or position of chief copy editor: He had the slot at the Gazette for 20 years. Compare rim ( def 7 ).
an allocated, scheduled time and place for an aircraft to take off or land, as authorized by an airport or air-traffic authority: 40 more slots for the new airline at U.S. airports.
Informal. slot machine ( def 1 ).
Aeronautics, See under slat1 ( def 2 ).
Ornithology. a narrow notch or other similar opening between the tips of the primaries of certain birds, which during flight helps to maintain a smooth flow of air over the wings.
Ice Hockey. an unmarked area near the front of an opponent's goal that affords a vantage for an attacking player.
Computers. expansion slot.
verb (used with object), slotted, slotting.
to provide with a slot or slots; make a slot in.
to place or fit into a slot: We've slotted his appointment for four o'clock.
verb (used without object), slotted, slotting.
to fit or be placed in a slot.

1300–50; Middle English: the hollow of the breastbone < Middle French esclot < ?

unslotted, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
slot1 (slɒt)
1.  an elongated aperture or groove, such as one in a vending machine for inserting a coin
2.  an air passage in an aerofoil to direct air from the lower to the upper surface, esp the gap formed behind a slat
3.  a vertical opening between the leech of a foresail and a mast or the luff of another sail through which air spills from one against the other to impart forward motion
4.  informal a place in a series or scheme
vb (usually foll by in or into) , slots, slotting, slotted
5.  (tr) to furnish with a slot or slots
6.  to fit or adjust in a slot
7.  informal to situate or be situated in a series or scheme
[C13: from Old French esclot the depression of the breastbone, of unknown origin]

slot2 (slɒt)
the trail of an animal, esp a deer
[C16: from Old French esclot horse's hoof-print, probably of Scandinavian origin; compare Old Norse sloth track; see sleuth]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "hollow at the base of the throat above the breastbone," from O.Fr. esclot, of uncertain origin. Sense of "narrow opening into which something else can be fitted" is first recorded 1523. Meaning "middle of the (semi-circular) copy desk at a newspaper," the spot occupied by the chief sub-editor,
is recorded from 1917. The sense of "opening in a machine for a coin to be inserted" is from 1888 (slot machine first attested 1891). The sense of "position in a list" is first recorded 1942; verb sense of "designate, appoint" is from 1960s. Slot car first attested 1966.

"bar or bolt used to fasten a door, window, etc.," c.1300, from M.Du. or M.L.G. slot (cf. O.N. slot, O.H.G. sloz, Ger. Schloss "bolt, bar;" O.S. slutil "key"), from P.Gmc. stem *slut- "to close" (cf. O.Fris. sluta, Du. sluiten, O.H.G. sliozan, Ger. schliessen "to shut, close"), from PIE base *klau-
"hook, peg" (cf. Gk. kleis "key;" L. claudere "to shut, close," clavis "key," clavus "nail;" see close (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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