calendar month

NOUN /kæləndər_mənθ/
14 LETTERS · 3 SYLLABLES · STARTS WITH C

calendar month is a valid 14-letter word worth 21 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3A1L1E1N1D2A1R1M3O1N1T1H4
3 + 1 + 1 + 1 + 1 + 2 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 4 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does calendar month mean?