noun, noun which may take the genitive case particle 'no'
monthly publication; monthly issue
Refers to a magazine, journal, or other periodical published once a month. Often used as a noun or with の to modify another noun.
この月刊誌は毎月25日に発売されます。
This monthly magazine goes on sale on the 25th of every month.
彼は月刊のニュースレターを編
He edits a monthly newsletter.