tuxedo
n. countable B2 Upper Intermediate US //ˌtəkˈsidoʊ// UK //tʌksˈiːdəʊ// tuxe·do
n. a formal suit for men, usually black or dark blue, worn for very special evening events. It often has shiny silk on the jacket's collar and is worn with a bow tie.
n. a formal evening suit for men, typically consisting of a dinner jacket with silk or satin lapels and matching trousers. Often associated with black-tie events.
He wore a black tuxedo to the wedding.
The invitation specified a black-tie dress code, so all the male guests arrived wearing tuxedos.
While modern fashion allows for various colors and cuts, the classic midnight blue tuxedo remains the standard for formal elegance at high-profile gala events.
Usage
Commonly used in American English; the British equivalent is 'dinner jacket'.