1. (a.) Continued a month, or a performed in a month; as, the monthly revolution of the moon.

2. (a.) Done, happening, payable, published, etc., once a month, or every month; as, a monthly visit; monthly charges; a monthly installment; a monthly magazine.

3. (n.) A publication which appears regularly once a month.

4. (adv.) Once a month; in every month; as, the moon changes monthly.

5. (adv.) As if under the influence of the moon; in the manner of a lunatic.

annual biannual biennial bimonthly biweekly catamenial centenary centennial daily daybook decennial diary diurnal ephemeris fortnightly gazette hebdomadal hourly journal magazine menstrual momentary momently newsmagazine organ periodical pictorial quarterly quotidian review secular semestral semiannual semimonthly semiweekly semiyearly serial slick magazine tertian trade magazine triennial weekly yearbook yearly