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A thin opening or groove, especially one that is narrow and elongated. You can send letters and postcards through the mail slot at the post office. Ultra-low-cost Irish airline RyanAir is thinking about putting a coin slot on lavatory doors so that passengers will have to pay when they use the facilities.
Football A space or gap between an end and a tackle in an offensive line. Also, the unmarked area in front of the goal on an ice hockey rink.
Linguistics A grammatical position within a construction that can be filled by any of a number of different morphemes or sequences of morphemes. Compare filler (def 9) and slot (def 11).
To put something in its proper place. I slotted my appointment for four o’clock. He fought his way into the lead slot in the race. The program received a new time slot on the broadcasting schedule.