I. month‧ly¹ /ˈmʌnθli/ adjective [only before noun]

1. happening once a month:
The mortgage is payable in monthly instalments.
a monthly publication

2. used to talk about the total amount of something that is received, paid, measured, or calculated in a month:
a monthly salary of $850
a monthly rainfall of four inches

3. a monthly ticket, pass etc can be used for a period of one month
—monthly adverb:
They meet monthly to discuss progress.

[TahlilGaran] Dictionary of Contemporary English ▲

II. monthly² noun (plural monthlies) [countable]
a magazine that appears once a month:
a leading women’s monthly

[TahlilGaran] Dictionary of Contemporary English ▲