progressive tense

NOUN
17 LETTERS · STARTS WITH P

progressive tense is a valid 17-letter word worth 22 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3R1O1G2R1E1S1S1I1V4E1T1E1N1S1E1
3 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 1 + 4 + 1 + 0 + 1 + 1 + 1 + 1 + 1 =22 PTS
DOUBLE WORD → 44TRIPLE WORD → 66
MEANING

What does progressive tense mean?