This is the 226th most frequent Ukrainian word.
своїй
"Своїй" means "to one's own" (feminine, dative case).
Shows possession referring to something belonging to the subject.
Вона довірилася своїй подрузі.
She confided in her friend.
Indicates the object the subject is interacting with and its relation.
Я пишу лист своїй сестрі.
I am writing a letter to my sister.
Refers to the group linked to the subject, signifying belonging or association.