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