This is the 17112th most frequent Polish word.
własna
"Own" (possessive, referring to something belonging to oneself).
The word 'własną' is used as an attribute to specify that it is one's own and is matched to the feminine noun 'książkę' in case and number.
Każdy powinien mieć własną książkę do czytania.
Everyone should have their own book to read.
Here, 'własny' is matched to the masculine noun 'pomysł', denoting possession or originality.
Mam własny pomysł na ten projekt.
I have my own idea for this project.
In this case, 'własne' agrees with the neutral noun 'mieszkanie', referring to ownership and individuality.