on monday
prep. phr.. A1 Beginner Oxford
prep. phr.. This phrase tells you that something happens on the specific day of the week called Monday.
prep. phr.. A prepositional phrase functioning as a temporal adverbial to specify the day of the week on which an event occurs.
The library is closed on Monday.
We have a team meeting every week on Monday to plan our tasks for the week.
The new regulations, which were debated for weeks, will officially come into effect on Monday morning.
Usage
The preposition 'on' is used for specific days of the week and for dates.
Teaching tip
Contrast the use of 'on' for days (on Monday) with 'in' for longer periods (in July, in 2024) and 'at' for clock times (at 9 AM).
Pitfall
I will see you in Monday.I will see you on Monday.Use the preposition 'on' for specific days of the week.