rigor
rig·or (rĭgʹər)n. 1. Strictness or severity, as in temperament, action, or judgment. 2. A harsh or trying circumstance; hardship. See Synonyms at difficulty. 3. A harsh or cruel act. 4. Medicine. Shivering or trembling, as caused by a chill. 5. Physiology. A state of rigidity in living tissues or organs that prevents response to stimuli. 6. Obsolete. Stiffness or rigidity. [Middle English rigour, from Old French, from Latin rigor, from rigēre, to be stiff. See reig- in Indo-European Roots.]
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