American English

Definition of rotation noun from the Oxford Advanced American Dictionary



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  1. 1[uncountable] the action of an object moving in a circle around a central fixed point the daily rotation of the earth on its axis
  2. 2[countable] one complete movement in a circle around a fixed point This switch controls the number of rotations per minute.
  3. 3[uncountable, countable] 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, corn, and sugar beets are planted in rotation. The committee is chaired by all the members in rotation.
adjective [only before noun] The event is held on a rotational basis in each of the participating countries.
See the Oxford Advanced Learner's Dictionary entry: rotation