actuation

NOUN
9 LETTERS · 4 SYLLABLES · STARTS WITH A

actuation is a valid 9-letter word worth 11 points in Scrabble and 14 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1C3T1U1A1T1I1O1N1
1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =11 PTS
DOUBLE WORD → 22TRIPLE WORD → 33
MEANING

What does actuation mean?