Noun showtime has 1 sense
  1. beginning, commencement, first, outset, get-go, start, kickoff, starting time, showtime, offset - the time at which something is supposed to begin; "they got an early start"; "she knew from the get-go that he was the man for her"
    --1 is a kind of point, point in time
    --1 has particulars:
     birth; incipiency, incipience; terminus a quo, starting point; threshold
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