Definition and etymology rhythm /ˈrɪð(ə)m/ Learn to pronounce noun noun: rhythm; plural noun: rhythms 1. a strong, regular repeated pattern of movement or sound. “Ruth listened to the rhythm of his breathing” synonyms: pattern, flow, tempo, regular features, recurrent nature “part of the normal rhythm of daily life” the systematic arrangement of musical sounds, principally according to duration and periodical stress. […]