The Latin synonym for "last month" is "praeteritus mensis." This phrase directly translates to refer to the month that has just passed. Another way to express this could be "mensis superior," meaning "the previous month."
A synonym for month is "Time".
latin
The synonym is also a transliteration of the Latin: prewar.
Augustan, classic, Latin
The Latin synonym for the Anglo-Saxon word "rim" would be "circumference" or "circulus."
latin
The Latin word for "month" is mensis.
gnosis
Dexter (Latin)
The abbreviation "ult." stands for the Latin "ultimo," or last-a date last month, during the preceding month. The abbreviation "ult" is often found in pre-1900 correspondence and in other early sources
The usual word for 'month' in Latin is [mensis].
August -- Augustus Caesar's month; Latin Augustus "Augustus"; Latin Augustus mensis "month of Augustus"; Latin sextilis mensis "sixth month"