月げつげつMeanings1nounMondayabbreviationAbbreviation of 月曜日. Common in casual schedules, timetables, and text messages.See also: 月曜次つぎの会かい議ぎは月げつの午ご後ごです。The next meeting is on Monday afternoon.月げつと金きんはジムに行いく。I go to the gym on Mondays and Fridays.