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ro·ta·tion (rō-tā'shən)
n.
    1. The act or process of turning around a center or an axis: the axial rotation of the earth.
    2. A single complete cycle of such motion.
  2. Mathematics. A transformation of a coordinate system in which the new axes have a specified angular displacement from their original position while the origin remains fixed.
  3. Regular and uniform variation in a sequence or series: a rotation of personnel; crop rotation.
  4. Games. An order of shooting balls in billiards in which the ball with the lowest number on the table is always pocketed first.
rotational ro·ta'tion·al adj.

logo The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

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