Month"ly, a. 1. Continued a month, or a performed in a month; as, the monthly revolution of the moon.

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

Month"ly, n.; pl. Monthlies (&?;). A publication which appears regularly once a month.

Month"ly, adv. 1. Once a month; in every month; as, the moon changes monthly. Shak.

2. As if under the influence of the moon; in the manner of a lunatic. [Obs.] Middleton.

• Once every month without fail.
  
• Occurring every month
  
• the menstrual period