motorcycle UK /ˈməʊtəˌsaɪkəl/US /ˈmoʊtɚˌsaɪkəl/noun 1verb 1forms 3 noun1 •a machine with an engine and two wheels that one person rides by sitting on it and holding bars at the frontHer big mission is to recover the precious Blue Star (a glowing rock in a box), which leads to a Western shoot-out, a space-age motorcycle gang, and an unamusing Darth Vader-esque villain. — 1995 verb1 •To ride a motorcycle. formsmotorcycled · motorcycling · motorcycles