Rhythm  n. 1 a periodical accent and the duration of notes in music, esp. As beats in a bar. B type of structure formed by this (samba rhythm). 2 measured regular flow of verse or prose determined by the length of and stress on syllables. 3 physiol. Pattern of successive strong and weak movements. 4 regularly recurring sequence of events.  rhythmic adj. Rhythmical adj. Rhythmically adv. [greek rhuthmos]