green beltTranslate green belt | into German | into Italian | into Spanish Definition of green belt noun 1chiefly British an area of open land around a city, on which building is restricted: Darlington should preserve its green belt 2a green belt marking a level of proficiency in judo, karate, or other martial arts below that of a brown belt. a person qualified to wear a green belt. green belt in other Oxford dictionaries Definition of green belt in the US English dictionary