The Collaborative International Dictionary of English v.0.48:

United \U*nit"ed\, a.
   Combined; joined; made one.
   [1913 Webster]

   United Brethren. (Eccl.) See Moravian, n.

   United flowers (Bot.), flowers which have the stamens and
      pistils in the same flower.

   The United Kingdom, Great Britain and Ireland; -- so named
      since January 1, 1801, when the Legislative Union went
      into operation.

   United Greeks (Eccl.), those members of the Greek Church
      who acknowledge the supremacy of the pope; -- called also
      uniats.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Unite \U*nite"\, v. t. [imp. & p. p. United; p. pr. & vb. n.
   Uniting.] [L. unitus, p. p. of unire to unite, from unus
   one. See One.]
   1. To put together so as to make one; to join, as two or more
      constituents, to form a whole; to combine; to connect; to
      join; to cause to adhere; as, to unite bricks by mortar;
      to unite iron bars by welding; to unite two armies.
      [1913 Webster]

   2. Hence, to join by a legal or moral bond, as families by
      marriage, nations by treaty, men by opinions; to join in
      interest, affection, fellowship, or the like; to cause to
      agree; to harmonize; to associate; to attach.
      [1913 Webster]

            Under his great vicegerent reign abide,
            United as one individual soul.        --Milton.
      [1913 Webster]

            The king proposed nothing more than to unite his
            kingdom in one form of worship.       --Clarendon.
      [1913 Webster]

   Syn: To add; join; annex; attach. See Add.
        [1913 Webster]

WordNet (r) 3.0 (2006):

united
    adj 1: characterized by unity; being or joined into a single
           entity; "presented a united front" [ant: divided]
    2: of or relating to two people who are married to each other
       [syn: joined, united]