Source : Webster's Revised Unabridged Dictionary (1913)

Intestate \In*tes"tate\, a. [L. intestatus; pref. in- not +
   testatus, p. p. of testari to make a will: cf. F. intestat.
   See {Testament}.]
   1. Without having made a valid will; without a will; as, to
      die intestate. --Blackstone.

            Airy succeeders of intestate joys.    --Shak.

   2. Not devised or bequeathed; not disposed of by will; as, an
      intestate estate.

Intestate \In*tes"tate\, n. (Law)
   A person who dies without making a valid will. --Blackstone.

Source : WordNet®

intestate
     adj : having made no legally valid will before death or not
           disposed of by a legal will; "he died intestate";
           "intestate property" [ant: {testate}]