/ ˈrɪðmɪk; NAmE / (also less frequent rhyth·mic·al / ˈrɪðmɪkl; NAmE /) adjective
having a regular pattern of sounds, movements or events :
music with a fast, rhythmic beat
the rhythmic ticking of the clock
► rhyth·mic·al·ly / -kli; NAmE / adverb
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WORD ORIGIN
early 17th cent.: from French rhythmique or via Latin from Greek rhuthmikos , from rhuthmos (related to rhein to flow).