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单词 rotation
释义

WordReference Random House Unabridged Dictionary of American English © 2024
ro•ta•tion  (rō tāshən),USA pronunciation n. 
  1. the act of rotating;
    a turning around as on an axis.
  2. Astronomy
    • the movement or path of the earth or a heavenly body turning on its axis.
    • one complete turn of such a body.
  3. regularly recurring succession, as of officials.
  4. AgricultureSee crop rotation. 
  5. Mathematics
    • an operation that rotates a geometric figure about a fixed point.
    • curl (def. 17).
  6. Games[Pool.]a game in which the balls are played in order by number.
  7. Sport[Baseball.]See pitching rotation. 
  • Latin rotātiōn- (stem of rotātiō) a rotation, rolling, equivalent. to rotāt(us) (see rotate1) + -iōn- -ion
  • 1545–55
ro•tation•al, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::
rotation /rəʊˈteɪʃən/ n
  1. the act of rotating; rotary motion
  2. a regular cycle of events in a set order or sequence
  3. a planned sequence of cropping according to which the crops grown in successive seasons on the same land are varied so as to make a balanced demand on its resources of fertility
  4. a circular motion of a configuration about a given point or line, without a change in shape
  5. a transformation in which the coordinate axes are rotated by a fixed angle about the origin

roˈtational adj
WordReference Random House Learner's Dictionary of American English © 2024
ro•tate1 /ˈroʊteɪt/USA pronunciation   v., -tat•ed, -tat•ing. 
v. 
  1. to (cause to) turn on an axis;
    revolve: [no object]The earth rotates once every twenty-four hours.[+ object]rotating the Frisbee on his finger.
  2. to (cause to) proceed in a fixed routine, as in a cycle: [no object]The firefighters rotate in shifts: one week in the Bronx, the next week in Brooklyn.[+ object]to rotate crops.
ro•ta•tion, n. [countable* uncountable]See -rota-.

WordReference Random House Unabridged Dictionary of American English © 2024
ro•tate1  (rōtāt or, esp. Brit., rō tāt),USA pronunciation v., -tat•ed, -tat•ing. 
v.t. 
  1. to cause to turn around an axis or center point;
    revolve.
  2. Agricultureto cause to go through a cycle of changes;
    cause to pass or follow in a fixed routine of succession:to rotate farm crops.
  3. to replace (a person, troops, etc.) by another or others, usually according to a schedule or plan.

v.i. 
  1. to turn around on or as if on an axis.
  2. to proceed in a fixed routine of succession:The sentries rotated in keeping watch.
  • Latin rotātus (past participle of rotāre to cause to spin, roll, move in a circle), equivalent. to rot(a) wheel + -ātus -ate1
  • 1800–10
rotat•a•ble, adj. 
rotat•a•bly, adv. 
    • 1.See corresponding entry in Unabridged wheel, whirl. See turn. 

ro•tate2  (rōtāt),USA pronunciation adj. 
  1. Botanywheel-shaped: applied esp. to a gamopetalous short-tubed corolla with a spreading limb. See illus. under corolla. 
  • Latin rot(a) wheel + -ate1
  • 1775–85

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更新时间:2025/7/23 16:21:34