Synonyms for Monthly:

adj.

periodic (adjective)
cyclic, hourly, cyclical, alternate, recurrent, repeated, rhythmic.

n.

cyclic, biennial, recurrent, cyclical, daily, alternate, phasic, bimonthly, annually, mensal, steadily, diurnal, regularly, methodically, punctually, rhythmic, menstrual, circadian, phaseal, periodically, from month to month, half-hourly, repeated, hourly, in its turn. april, jan, dec, apr, feb, calendar month, february, december, aug, august. biweekly, back issue, comic, back-number, compact, bulletin, back copy, comic book, broadsheet, brochure. journal (noun)
comic book, daily.
magazine (noun)
biweekly, bimonthly, brochure.
monthly (noun)
each month, every month.

Other synonyms:

biweekly, regularly. daily. Other relevant words:
april, mensal, steadily, august, cyclic, cyclical, brochure, bimonthly, broadsheet, circadian, feb, december, comic, diurnal, biennial, bulletin, menstrual, phaseal, recurrent, apr, punctually, dec, periodically, phasic, february, biweekly, jan, alternate, half-hourly, methodically, aug, rhythmic, annually, daily, repeated, hourly, compact, regularly.

Usage examples for monthly

  1. I give up every other occupation in order to read them in detail and to observe the difference between one monthly return and another. – The Project Gutenberg Memoirs of Napoleon Bonaparte by Bourrienne, Constant, and Stewarton
  2. The next report was published in the U. S. Weather Bureau's monthly Weather Review. – The Flying Saucers are Real by Donald Keyhoe