monday

Mon‧day /ˈmʌndi, -deɪ/ BrE AmE noun [uncountable and countable] (written abbreviation Mon.)
[Language: Old English; Origin: monandæg, from a translation of Latin lunae dies 'day of the moon']
the day between Sunday and Tuesday
on Monday
It was raining on Monday.
The president announced Monday that he would cancel the debt. American English
Monday morning/afternoon etc
Let’s go out for a meal on Monday night.
last Monday
Kelly arrived last Monday.
this Monday
The UK office will open for business this Monday.
next Monday (=Monday of next week)
Shall we meet next Monday?
a Monday (=one of the Mondays in the year)
My birthday’s on a Monday this year.

Oxford Advanced Learner's Dictionary

Monday

Mon·day [Monday Mondays] [ˈmʌndeɪ] [ˈmʌndeɪ] [ˈmʌndi] [ˈmʌndi] noun countable, uncountable (abbr. Mon.)
the day of the week after Sunday and before Tuesday, the first day of the working week
• It's Monday today, isn't it?
• She started work last Monday.
• Are you busy next Monday?
• Monday morning/afternoon/evening
• We'll discuss this at Monday's meeting.
• Do we still have Monday's paper?
• I work Monday to Friday.
• I work Mondays to Fridays.
• On Monday(s) (= Every Monday) I do yoga.
• I always do yoga on a Monday.
• He was born on a Monday.
• I went to Paris on Thursday, and came back the following Monday.
• We'll meet on Monday.
• (BrE) ‘When did the accident happen?’ ‘It was the Monday (= the Monday of the week we are talking about).’
• (BrE) Come back Monday week (= a week after next Monday).

• (informal or NAmE) We'll meet Monday. From the Old English for ‘day of the moon’, translated from Latin lunae dies.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition

Monday / ˈmʌn.deɪ / noun [ C or U ] ( written abbreviation Mon. )

A1 the day of the week after Sunday and before Tuesday:

I start my new job on Monday.

Don't you hate going back to school on Mondays?

I'll see you next Monday.

He was late for work last Monday.

The baby was born on a Monday.

Monday morning/afternoon/evening/night

Collins COBUILD Advanced Learner’s English Dictionary

Monday

/mʌndeɪ, -di/
(Mondays)

Monday is the day after Sunday and before Tuesday.
I went back to work on Monday...
The attack took place last Monday...
I’m usually here on Mondays and Fridays.

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary:

Monday

Mon·day /ˈmʌnˌdeɪ/ noun, pl -days : the day of the week between Sunday and Tuesday

[count]

• 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.

[noncount]

• 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.
- abbr. Mon.;
- Mondays adv
• He works late Mondays. [=he works late every Monday]