Definition of rotation in English:

rotation

Line breaks: ro|ta¦tion
Pronunciation: /rə(ʊ)ˈteɪʃ(ə)n
 
/

noun

[mass noun]
1The action of rotating about an axis or centre: the moon moves in the same direction as the earth’s rotation [count noun]: several solar rotations
More example sentences
  • With the motion and rotation of Earth, the coordinates dance all around in a strange mess that is extremely difficult to untangle.
  • The earth moves around the sun in an orbit that is nearly a circle, and the axis of rotation of the earth maintains an effectively fixed direction.
  • Its chambers and tunnel will allow visitors to perceive the earth's rotation and its changing alignments with the stars.
Synonyms
1.1 Mathematics The conceptual operation of turning a system about an axis.
1.2 Mathematics another term for curl (sense 3) of the noun).
2The passing of a privilege or responsibility to each member of a group in a regularly recurring order: it has become common for senior academics to act as heads of department in rotation
More example sentences
  • Gurkha battalions have been stationed there in rotation for the past twenty-five years.
  • Their substantial independence threatened republican tradition with its corporate government and brief periods of high office for individuals in rotation.
  • There are occasions where there are two Bards sharing the telling in rotation, enabling an even more embellished tale to be told.
Synonyms
sequence, succession; alternation, cycle
2.1 (also crop rotation) The growing of different crops in succession on a piece of land to avoid exhausting the soil and to control weeds, pests, and diseases: traditional practices such as crop rotation
More example sentences
  • He uses cow manure, green manure and crop rotation to ensure nutrient-rich soil for his rapeseed crop.
  • It appears that factors of fall moisture, winter exposure, leaf diseases, and early summer heat are larger than crop rotation and or tillage method.
  • Disease-resistant varieties, crop rotation, and tillage are especially important in management of wheat diseases.
2.2 Forestry The cycle of growth and felling or cutting of trees: short rotation forestry [count noun]: a rotation of 60-80 years to provide valuable saw timber
More example sentences
  • If the forest has a non-timber value, for instance, in terms of its recreation value or its value as a wildlife habitat, then this changes the socially optimal forest rotation.
  • Initial growth rates can be improved for higher assurance of success and shorter rotations.
  • The region also plays host to a large number of birches to add variety, a component that forest management plans aim to maintain past the current rotation.
2.3 [count noun] US A tour of duty, especially by a medical practitioner in training: she was completing a rotation in trauma surgery
More example sentences
  • They focus on core programs in analytics, and then have a very experiential period - similar to the clinical rotations used in other professions.
  • Kate told Stephen how she got on the accelerated Medicine program at Boston University and that all of her rotations would transfer over to UIC except the ER.
  • Classroom training is then combined with hands-on experience that includes a general rotation in every department of the company.

Origin

mid 16th century: from Latin rotatio(n-), from the verb rotare (see rotate).

Derivatives

rotational

adjective
More example sentences
  • The number of bumps on each wheel in combination with the rotational speed determined the pitch produced by a particular tone wheel assembly.
  • And my brother and I had put her in front of the rotational sprinkler too many times.
  • Be sure to place stations in different parts of the field (areas with different rotational histories, soil types, low or high spots, etc.) to obtain a representative sample.

rotationally

adverb
More example sentences
  • If grown with tall-growing grasses and grazed rotationally, the pastures should be grazed at relatively short intervals to prevent excessive shading by the grass.
  • With rotationally deploying ships from both the Atlantic and Pacific Fleets, 5th Fleet typically has more than a dozen ships and 15,000 to 20,000 Sailors and Marines.
  • The lower eye is rotationally symmetrical, but the upper eye is only bilaterally symmetrical (front view shown to the right).

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