monthlyPronunciation: /ˈmʌnθli/Translate monthly | into French | into German | into Italian | into Spanish Definition of monthly adjective done, produced, or occurring once a month:the Council held monthly meetings adverb once a month; every month:most of us get paid monthly noun (plural monthlies) 1a magazine that is published once a month: an Anglo-American monthly whose appeal was always international 2 (monthlies) informal a menstrual period: cramps from your monthlies so bad you could weepmonthly in other Oxford dictionaries Definition of monthly in the US English dictionary