Occurring every month.

Every month.

A publication that is published once a month. / (euphemistic) The menstrual period.

plural of monthly

Alternative spelling of semimonthly

Occurring twice per month.

Occurring three times every month. / Published three times per month.

plural of monthly meeting

Used other than figuratively or idiomatically: see monthly, meeting.

(euphemistic slang) The menstrual period.