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polar axis

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polar axis

–noun Mathematics.
the fixed line, usually horizontal, from which the angle made by the radius vector is measured in a polar coordinate system.

Origin:
1890–95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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polar axis  
n.  The fixed reference axis from which the polar angle is measured in a polar coordinate system.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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