From Longman Dictionary of Contemporary EnglishMondayMon‧day /ˈmʌndi, -deɪ/ ●●● S2 W2 noun [countable, uncountable] (written abbreviation Mon.) TMCthe day between Sunday and Tuesdayon Monday It was raining on Monday. The president announced Monday that he would cancel the debt. American EnglishMonday 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.
Examples from the CorpusMonday• Steve said he'd arrive Monday.• Must have had a bad Monday.• Open 5 p.m.-2 a.m. every day except Monday.• By midday Monday, Mr Hickey had worked 28 straight hours, and there was no end in sight.• In a press release Monday, Wildfire said the investments enable it to improve the accessibility and affordability of Wildfire.• Lamar Alexander, who spent Monday hunkered down in strategy sessions at his Nashville headquarters.• Lifeguards say the calf spotted Monday showed no sign of injury and still had a stubby part of its umbilicus attached.on Monday• It was raining on Monday.Origin Monday Old English monandæg, from a translation of Latin lunae dies “day of the moon”