per mensem

per mensem

(ˈpɜː ˈmɛnsəm)
adv
every month or by the month
References in classic literature ?
My son, sir, is at this minute chief magistrate of Ramgunge in the Presidency of Bengal, and touching his four thousand rupees per mensem.
Accordingly, demographers have developed analytical techniques and procedures that allow them at once to measure seasonality and to standardize raw figures on vital events per mensem or season by adjusting for differences in the number of days per month in the calendar year.