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which (EN)
determiner, pronoun

determiner “which”

which
  1. asking to specify one or more items from a known set
    Which dress do you think looks better on me, the red one or the blue one?
  2. whichever
    Choose which dessert you'd like to have; they're all delicious.

pronoun “which”

which
  1. (not modifying a noun) asks to choose one or more items from a known set
    There are two cupcakes left, chocolate and vanilla; which would you prefer?
  2. (not modifying a noun) whichever
    Take which you want from the jar.
  3. introduces extra information about a subject already mentioned
    She handed me her camera, which was the most expensive model in the store.