Definition of "rigour"

rigour

/ˈɹɪɡə(ɹ)/

noun
countable and uncountable, plural rigours
1. Severity or strictness.
  Quotations
  And the Egyptians made the children of Israel to serve with rigour: And they made their lives bitter with hard bondage, in morter, and in brick, and in all manner of service in the field: all their service, wherein they made them serve, was with rigour.
  1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], Exodus 1:13–14
2. Harshness, as of climate.
3. A trembling or shivering response.
4. Character of being unyielding or inflexible.
5. Shrewd questioning.
6. Higher level of difficulty.
7. (Britain) Misspelling of rigor (“rigor mortis”).