Usage Note
Mil is invariable (never miles as a quantifier: dos mil personas, not dos miles); miles is a noun meaning 'thousands' used in the phrase miles de ('thousands of'). Unlike cien and ciento, mil does not require un before it: 'one thousand' is simply mil, not un mil.
Examples
"El coche costó diez mil euros."
Natural Translation
The car cost ten thousand euros.
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