braPronunciation: /brɑː/Translate bra | into French | into German | into Italian | into Spanish Definition of bra noun an undergarment worn by women to support the breasts. (also auto bra, car bra) North American a carbon-based cover that fits over the front bumper of a car. Derivatives braless adjective Origin: 1930s: abbreviation of brassierebra in other Oxford dictionaries Definition of bra in the US English dictionary