The Collaborative International Dictionary of English v.0.48:

Vested \Vest"ed\, a.
   1. Clothed; robed; wearing vestments. "The vested priest."
      --Milton.
      [1913 Webster]

   2. (Law) Not in a state of contingency or suspension; fixed;
      as, vested rights; vested interests.
      [1913 Webster]

   Vested legacy (Law), a legacy the right to which commences
      in praesenti, and does not depend on a contingency; as, a
      legacy to one to be paid when he attains to twenty-one
      years of age is a vested legacy, and if the legatee dies
      before the testator, his representative shall receive it.
      --Blackstone.

   Vested remainder (Law), an estate settled, to remain to a
      determined person, after the particular estate is spent.
      --Blackstone. --Kent.
      [1913 Webster]