immemorial usage

16 LETTERS · STARTS WITH I

immemorial usage is a valid 16-letter word worth 22 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
I1M3M3E1M3O1R1I1A1L1U1S1A1G2E1
1 + 3 + 3 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 2 + 1 =22 PTS
DOUBLE WORD → 44TRIPLE WORD → 66
MEANING

What does immemorial usage mean?

1