yours pronoun (PERSON/PEOPLE ADDRESSED)
A2 the one(s) belonging to or connected with the person or group of people being spoken or written to:
Is this pen yours?
I've got something of yours (= that belongs to you).
B1 used at the beginning of some phrases written at the end of a letter, before giving a name:
Yours, Jack
Yours faithfully/sincerely, K. Maxwell.
More examples