( BrE ) ( NAmE rigor ) / ˈrɪgə(r); NAmE / noun
1.
[ U ] the fact of being careful and paying great attention to detail :
academic / intellectual / scientific, etc. rigour
2.
[ U ] ( formal ) the fact of being strict or severe
SYN severity :
This crime must be treated with the full rigour of the law.
3.
the rigours of sth [ pl. ] the difficulties and unpleasant conditions of sth :
The plants were unable to withstand the rigours of a harsh winter.
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WORD ORIGIN
late Middle English : from Old French rigour from Latin rigor stiffness.