Learner's definition of MONDAY
: the day of the week between Sunday and Tuesday
I had lunch with her last Monday.
I'll be seeing her again next Monday.
The class meets on Mondays. [=every Monday]
My birthday falls on a Monday this year.
(Brit) Next week I'll arrive on the Monday and leave on the Friday.
— abbreviation Mon.
Next week I'll arrive on Monday and leave on Friday.
The paper is due on Monday. = (chiefly US) The paper is due Monday.
I will arrive on Monday morning.