rigour

NOUN /riɡər/
6 LETTERS · STARTS WITH R

rigour is a valid 6-letter word worth 7 points in Scrabble and 9 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1I1G2O1U1R1
1 + 1 + 2 + 1 + 1 + 1 =7 PTS
DOUBLE WORD → 14TRIPLE WORD → 21
MEANING

What does rigour mean?