1 : a regular, repeated pattern of sounds or movements
The music has a fast/slow/steady rhythm. [=beat]
— often + of
the rhythm of the poetry
the rhythm of his breathing
the rhythm of the tides
the composer's use of jazz rhythm
He can't play/dance in rhythm. = He has no sense of rhythm. [=he cannot play/dance at the correct speed to stay with the rhythm of the music]
2 [count] : a regular, repeated pattern of events, changes, activities, etc.
She enjoyed the rhythms of country life.
Travel can disrupt your body's daily/biological/circadian rhythm.