first period

NOUN
12 LETTERS · STARTS WITH F

first period is a valid 12-letter word worth 17 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
F4I1R1S1T1P3E1R1I1O1D2
4 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 2 =17 PTS
DOUBLE WORD → 34TRIPLE WORD → 51
MEANING

What does first period mean?

NOUN · 1 SENSE
1

The first division into which the play of a game is divided.