granting immunity

NOUN
17 LETTERS · STARTS WITH G

granting immunity is a valid 17-letter word worth 25 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
G2R1A1N1T1I1N1G2I1M3M3U1N1I1T1Y4
2 + 1 + 1 + 1 + 1 + 1 + 1 + 2 + 0 + 1 + 3 + 3 + 1 + 1 + 1 + 1 + 4 =25 PTS
DOUBLE WORD → 50TRIPLE WORD → 75
MEANING

What does granting immunity mean?