Definition of broad day:
(n) :
The theater district of Manhattan.
(n) :
The theatres in the Broadway theatre district; especially those covered by contracts between the owners and theatrical unions.
(n) :
(metonymic) The American theater industry.
(n) :
The wide road which runs diagonally through Manhattan, New York City.
(n) :
A street name, typically for a wide road; a broad way.
(n) :
A place name for a settlement which grew up around such a road. For example, Broadway, Worcestershire, Broadway, Somerset.