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a time assigned on a schedule or agenda synonyms: slot see moresee less type of: interval, time interval a definite length of time marked off by two

The earliest known use of the noun time slot is in the 1940s OED's earliest evidence for time slot is from 1942, in Billboard  The time slot or frequency band vacated by the diverted signal need not necessarily be reoccupied by another signal From Wikipedia

semesta slot A time slot management system enables customers to choose delivery timings based on availability and convenience An optimized time slot booking software is A television or radio programme's time slot is the time when it is broadcast 90 per cent of listeners had stayed with the programme