matrix operation

NOUN
16 LETTERS · STARTS WITH M

matrix operation is a valid 16-letter word worth 26 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3A1T1R1I1X8O1P3E1R1A1T1I1O1N1
3 + 1 + 1 + 1 + 1 + 8 + 0 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =26 PTS
DOUBLE WORD → 52TRIPLE WORD → 78
MEANING

What does matrix operation mean?