Meaning of the word rigor in English

What does rigor mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

rigor

US /ˈrɪɡ.ɚ/
UK /ˈrɪɡ.ər/

Noun

the fact that people are made to follow rules in a very severe way:

Example:
They were punished with unusual rigor.