onward motion

NOUN
13 LETTERS · STARTS WITH O

onward motion is a valid 13-letter word worth 18 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
O1N1W4A1R1D2M3O1T1I1O1N1
1 + 1 + 4 + 1 + 1 + 2 + 0 + 3 + 1 + 1 + 1 + 1 + 1 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does onward motion mean?