This is the 382nd most frequent Slovenian word.
kje
"Where."
The word 'kje' is used here as an interrogative adverb to ask about a location.
Kje živiš?
Where do you live?
In this sentence, 'kje' introduces an indirect question about a location.
Ne vem kje je ključe pustil.
I don't know where he left the keys.
Here, 'kje' functions as a part of an indirect question embedded in a statement.