means The act of turning around a central point or axis, or a regular cycle in which things take turns or recur in sequence.

from From Latin rotare, 'to turn in a circle,' built on rota, 'wheel' — the same root that spins beneath 'rotary,' 'rotor,' and even 'round.' The noun rotatio described a wheeling motion, and English borrowed it to name everything from the Earth's daily turn to crop fields cycling through their seasons.