when something turns with a circular movement around a central point
the rotation of the Earth on its axis
the planet's rotation around the sun
one complete circular turn around a central point [= revolution]:
The blades spin at 100 rotations per minute.
the practice of regularly changing the thing that is being used or done, or the person who does a particular job:
Three plays will be performed in rotation during the drama festival.
4 [countable] American English
a period of time spent doing a particular job, when you will soon change to a different job for the same employer:
a young doctor on a rotation in the children's ward
5 [countable] American English
the people who each take a turn to do a particular job in a regular order:
The rotation included two rookies, Hernandez and Saunders.