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rigour
noun
1.
the quality of being valid and rigorous
cogency
rigor
validity
Exemplifies:
Australian spelling
British spelling
Canadian spelling
2.
something hard to endure
asperity
grimness
hardship
rigor
rigorousness
rigourousness
severeness
severity
Exemplifies:
Australian spelling
British spelling
Canadian spelling
3.
excessive sternness
hardness
harshness
inclemency
rigor
rigorousness
rigourousness
severeness
severity
stiffness
Exemplifies:
Australian spelling
British spelling
Canadian spelling