How to Say "monday" in Spanish
The Spanish word for “monday” is “lunes” — A1 level. This is a very common word in everyday Spanish.

Examples
El lunes empiezo mi nuevo trabajo.
On Monday I start my new job.
Todos los lunes vamos al gimnasio.
Every Monday we go to the gym.
No me gusta el lunes, prefiero el viernes.
I don't like Mondays, I prefer Fridays.
Masculine Article Required
Days of the week are always masculine, so you must use 'el' for one Monday (El lunes) or 'los' for multiple Mondays (Los lunes).
No Preposition 'On'
Unlike English, Spanish usually doesn't need a word like 'on' (en) before the day. Just use the article: 'Voy a la tienda el lunes' (I'm going to the store on Monday).
Capitalization Error
Mistake: “Empezamos el Lunes.”
Correction: Empezamos el lunes. (Spanish does not capitalize days of the week or months unless they start a sentence.)
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