The Collaborative International Dictionary of English v.0.48:

owned \owned\ adj.
   having an owner; often used in combination; as, state-owned
   railways. Opposite of unowned.
   [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Own \Own\, v. t. [imp. & p. p. Owned; p. pr. & vb. n.
   Owning.] [OE. ohnien, ahnien, AS. [=a]gnian, fr. [=a]gen
   own, a. See Own, a.]
   To hold as property; to have a legal or rightful title to; to
   be the proprietor or possessor of; to possess; as, to own a
   house.
   [1913 Webster]

WordNet (r) 3.0 (2006):

owned
    adj 1: having an owner; often used in combination; "state-owned
           railways" [ant: ownerless, unowned]

The Jargon File (version 4.4.7, 29 Dec 2003):

owned


    1. [cracker slang; often written ?0wned?] Your condition when your machine
    has been cracked by a root exploit, and the attacker can do anything with
    it. This sense is occasionally used by hackers.

    2. [gamers, IRC, crackers] To be dominated, controlled, mastered. For
    example, if you make a statement completely and utterly false, and someone
    else corrects it in a way that humiliates or removes you, you are said to ?
    have been owned? by that person. When referring to games, ?I own0r UT GOTYE
    ? means that one has mastered Unreal Tournament, Game of the Year Edition
    to such a level that even the hardest AI characters are mere lunchmeat, and
    that no ordinary mortal player would even receive a point in competition.
    There are several spelling variants: 0wned, 0wn0r3d, even pwn0r3d. Hackers
    do not use this sense.

    P