Found in the following dictionaries
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Showtime" Definition
noun
Slang The time at which an activity is to begin.
Source: American Heritage Dictionary
The time at which an entertainment, such as the showing of a movie, is scheduled to start.
Source: American Heritage Dictionary
The scheduled or actual time at which a show or something likened to a show begins.
Source: Merriam-Webster
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