Crossword Genius

Extreme exactitude (5)

Ross

I believe the answer is:

rigor

(Other definitions for rigor that I've seen before include "Muscular cramp" , "Chilled shivering often a symptom of disease" , "Hardship" , "Stiff, irresponsive state" , "- - mortis" .)

I've seen this clue in the Newsday.
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