Definition of monthly

• a. - Continued a month, or a performed in a month; as, the monthly revolution of the moon.
• a. - Done, happening, payable, published, etc., once a month, or every month; as, a monthly visit; monthly charges; a monthly installment; a monthly magazine.
• n. - A publication which appears regularly once a month.
• adv. - Once a month; in every month; as, the moon changes monthly.
• adv. - As if under the influence of the moon; in the manner of a lunatic.