This is the 704th most frequent Estonian word.
milline
"Milline" means "which" or "what kind of" in English.
The word 'milline' is used here as an interrogative adjective to select a specific option from multiple possibilities.
Milline raamat sulle meeldib?
Which book do you like?
'Milline' functions as a relative pronoun, introducing a clause that specifies the subject of the sentence.
Ma ei mäleta, milline film mulle kõige rohkem meeldis.
I don't remember which movie I liked the most.
'Milline' is employed to elicit an evaluative response about preferences or opinions.