Usage Note
Aucuns is the rare plural form of aucun, used only with nouns that exist solely in the plural — sans aucuns frais ('at no cost') being the most common fixed phrase. Outside those set expressions, singular aucun/aucune is the normal negative determiner. Learners almost never need to produce aucuns actively.
Examples
"Il a voyagé sans aucuns frais."
Natural Translation
He travelled at no cost.
Literal Translation
He has travelled without any costs.

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