11-o-clock-number Definition
noun
A showstopping song that occurs late in the second act of a two-act musical , often signifying a moment of revelation or change of heart of a lead character .
Wiktionary
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Other Word Forms of 11-o-clock-number
Noun
Singular:
11-o-clock-number
Plural:
11 o'clock numbersOrigin of 11-o-clock-number
So called because, in the days when musical performances began at 8:30 p.m., such a song would occur around 11 p.m.
From Wiktionary