per calendar month
adverb UK formal uk/pɜː ˈkæl.ən.də ˌmʌnθ/ us/pɝː ˈkæl.ən.dɚ ˌmʌnθ/ (written abbreviation pcm)
每月
used in business when referring to an amount that is produced, sold, or spent each month
The rent for the house is £1200 per calendar month. 这栋房子每月租金为1200英镑。