A large tent with open sides, used for outdoors entertainment.
"The festival organizers set up a marquee on the fairgrounds to host their outdoor concert under the stars."
To select (an object or region) with the marquee selection tool.
"I clicked and dragged across the image to marquee the area I wanted to crop out."
Most famous; preeminent.
"The marquee attraction of the summer festival was undoubtedly the legendary jazz band performing their final tour."