I. -lē adverb
Date: circa 1534
: once a month : by the month
II. adjective
Date: 1572
1.
a. : of or relating to a month
b. : payable or reckoned by the month
2. : lasting a month
3. : occurring or appearing every month
III. noun
( plural monthlies )
Date: 1833
1. : a monthly periodical
2. plural : a menstrual period