rigor

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rigour

(US), rigor
Maths Logic logical validity or accuracy
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

rigor

[′rig·ər]
(medicine)
Stiffness.
A chill associated with muscular contraction and tremor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.