locomotive UK /ˌləʊkəˈməʊtɪv/US /ˌloʊkəˈmoʊtɪv/noun 5adjective 3forms 3 noun5 •The power unit of a train that pulls the coaches or wagons.As on all other British Railways standard locomotives to date, the lubrication of motion pins and reversing gear is by grease nipple and gun. — 1953 •(rare) A traction engine. •A country which drives the world economy by having a high level of imports, such as the United States. •(slang) A cheer characterized by a slow beginning and a progressive increase in speed. •(no longer used) Any of various early road vehicles, steam-powered, etc., forerunners of the modern car. adjective3 •Of or relating to locomotion. •Moving, or capable of motion.Pindar seems to imply that these figures were actually locomotive automata. — 1879 •Of or relating to the power unit of a train which does not carry passengers or freight itself. formslocomotives · more locomotive · most locomotive