Having slots or narrow openings cut into it. Also means scheduled or assigned to a particular time or position.
From Middle English 'slot', originally meaning 'the hollow running down the middle of the chest', from Old French 'esclot'. The meaning evolved to include any narrow opening, then to scheduling contexts.
The word's journey from describing anatomy to describing scheduling shows how language adapts - we went from 'slotted' armor pieces to 'time slots' in just a few centuries. Modern usage in airports and broadcasting keeps this metaphor alive.
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