Rhythmic means having a regular repeated beat. Waves on shingle, a train over rail joints.
Music owns the word first, but it suits anything that repeats evenly — rhythmic breathing, the rhythmic clack of knitting needles, rhythmic applause. Sport has rhythmic gymnastics, performed with ribbons and hoops to music. The noun is rhythm, one of the few English words with no proper vowel in the middle and a reliable trap in spelling tests. Rhythmical is an equally correct if slightly older variant.
1adjectiverhythmicHaving a strong, regular repeated beat.
“The rhythmic thud of the pump kept him awake.”
Ancient Greek
ῥυθμικός
English, today
rhythmic
From Ancient Greek ῥυθμικός, from und + ῥῠθμός. From Ancient Greek ῥυθμικός, from ῥυθμός + ικός, equivalent to rhythm + -ic.
Etymology from Wiktionary, CC BY-SA