/
ˈrɪð(ə)m/
n.
   - a strong, regular repeated pattern of movement or sound. 
▸the systematic arrangement of musical sounds, according to duration and periodical stress.
 ▸a type of pattern formed by this.
 ▸a person's natural feeling for musical rhythm.
 - the measured flow of words and phrases in verse or prose as determined by the length of and stress on syllables.
 - a regularly recurring sequence of events or actions:
 the rhythms of the tides.
 
Derivative
Etymology
C16 (also orig. in the sense ‘rhyme’): from Fr. rhythme, or via L. from Gk rhuthmos (rel. to rhein ‘to flow’).