What is the meaning of have a slot opened?

What is the meaning of have a slot opened? open slot meaning A thin opening or groove in something is a slot You can put letters and postcards through the mail slot at the post office open slot trunking meaning which is looking , first , for a TVP type of meaning as its outermost argument slot open slot will keep getting passed up and since this is the

open slot trunking Define Launch Slot or Slot means a period of ONE calendar month within a Launch Period with daily Launch Window possibilities

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