1 [U] the action of an object moving in a circle around a central fixed point:
the daily rotation of the earth on its axis
2 [C] one complete movement in a circle around a fixed point:
This switch controls the number of rotations per minute.
3 the act of regularly changing the thing that is being used in a particular situation, or of changing the person who does a particular job:
crop rotation / the rotation of crops (= changing the crop that is grown on an area of land in order to protect the soil) * job rotation (= the practice of regularly changing the job that a particular person does so that they become experienced in different areas) * Wheat, maize and sugar beet are planted in rotation. * The committee is chaired by all the members in rotation.
rotational adjective [onlybeforenoun]:
The event is held on a rotational basis in each of the participating countries.
