A marquee is a large sign or structure over a theater or building entrance that displays the name of a show or event. As an adjective, 'marquee' can describe a very famous or top-billed person or event.
From French 'marquise', a type of canopy or tent, related to the noble title 'marquis'. The sense shifted from a tent-like shelter to the covered entrance of a theater, and then to the sign itself.
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