World English Dictionary
rigour or (US) rigor (ˈrɪɡə)
1.  harsh but just treatment or action
2.  a severe or cruel circumstance; hardship: the rigours of famine
3.  strictness, harshness, or severity of character
4.  strictness in judgment or conduct; rigorism
5.  maths, logic logical validity or accuracy
6.  obsolete rigidity
[C14: from Latin rigor]
rigor or (US) rigor
[C14: from Latin rigor]

Collins English Dictionary - Complete & Unabridged 10th Edition
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