How to Say "one thousand" in Spanish
The most common Spanish word for “one thousand” is “mil” — use 'mil' when you are stating the number 1,000 directly, such as when giving a price or quantity.
mil
meelmil

Examples
Este teléfono cuesta mil euros.
This phone costs a thousand euros.
La ciudad fue fundada en el año mil novecientos.
The city was founded in the year nineteen hundred.
Necesito dos mil dólares para el viaje.
I need two thousand dollars for the trip.
Stays the Same in Plural
Unlike other numbers, 'mil' doesn't change when you put another number before it. It's 'dos mil' (2,000), 'cinco mil' (5,000), 'cien mil' (100,000), etc. The word 'mil' itself stays the same.
No 'Un' Needed
When you mean exactly 1,000, you just say 'mil', not 'un mil'. For example, 'Tengo mil libros' (I have a thousand books).
Saying 'un mil'
Mistake: “Compré un mil cosas en el mercado.”
Correction: Compré mil cosas en el mercado. You only need to say 'mil' for 'one thousand'. The 'un' is not necessary and sounds unnatural.
luca
loo-kahˈluka

Examples
Préstame una luca para el café, por favor.
Lend me a thousand (pesos) for the coffee, please.
Esa camiseta me costó diez lucas en la feria.
That t-shirt cost me ten thousand in the street market.
Ando corto de plata, no tengo ni una luca.
I'm short on cash, I don't even have a single thousand.
Counting with Lucas
In Spanish, the standard word 'mil' (thousand) never changes to 'mils.' However, because 'luca' is a regular noun, you must make it plural by adding an 's': 'una luca,' 'dos lucas,' 'cien lucas.'
The Gender of Money Slang
Even though 'peso' is masculine, 'luca' is a feminine noun. You must use feminine articles like 'una' or 'las' when talking about it.
Using it in the wrong country
Mistake: “Using 'luca' in Spain or Mexico.”
Correction: In Spain, use 'pavo' for euros; in Mexico, use 'lana' or 'varo' for money. 'Luca' is specifically South American (Chile, Argentina, Colombia, Uruguay).
Formal Situations
Mistake: “Saying 'Son cinco lucas' to a bank teller.”
Correction: Keep 'luca' for friends and casual markets. In a bank or professional setting, always use 'mil pesos'.
Using 'luca' instead of 'mil'
Related Translations
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