assembling

NOUN
10 LETTERS · STARTS WITH A

assembling is a valid 10-letter word worth 15 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1S1S1E1M3B3L1I1N1G2
1 + 1 + 1 + 1 + 3 + 3 + 1 + 1 + 1 + 2 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does assembling mean?