Monday
noun
This is a day of the week. You know this because it has 曜日 in it. But what day of the week is it? The "moon" day of the week is monday. Why? Because "Moon" is pretty much just "Mon," right?
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will help to know the word 曜日 as well.
今度の月曜日、仕事の後、飲みに行かない？
Would you like to go out for a drink this coming Monday after work?
月曜日は新しい週の始まりです。
Monday is the beginning of a new week.
月曜日はいつも起きるのがツライです。会社に行きたくないんで。
I always have a hard time getting up on Mondays. I don't want to go to work.