1. a powered rail vehicle used for pulling trains:"a diesel locomotive"
adjective
1. relating to or effecting locomotion: "locomotive power"
▪ (of a machine, vehicle, or animal) having the power of progressive motion:"locomotive bivalves have the strongest hinges"
Word Originearly 17th century (as an adjective): from modern Latin locomotivus, from Latin loco (ablative of locus ‘place’) + late Latin motivus ‘motive’, suggested by medieval Latin in loco moveri ‘move by change of position’.