portable computer

NOUN
17 LETTERS · STARTS WITH P

portable computer is a valid 17-letter word worth 26 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3O1R1T1A1B3L1E1C3O1M3P3U1T1E1R1
3 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 0 + 3 + 1 + 3 + 3 + 1 + 1 + 1 + 1 =26 PTS
DOUBLE WORD → 52TRIPLE WORD → 78
MEANING

What does portable computer mean?