rigor

Short definition from Wiktionary

Noun

1. 1
   Severity or strictness.
2. 2
   Harshness, as of climate.
3. 3
   A trembling or shivering response.
4. 4
   Character of being unyielding or inflexible.
5. 5
   Shrewd questioning.
6. 6
   Higher level of difficulty.
7. 7
   A feeling of cold with shivering accompanied by a rise in body temperature.
8. 8
   Ellipsis of rigor mortis.

Proper noun

1. 1
   A surname from Spanish.