Source : Webster's Revised Unabridged Dictionary (1913)

Sire \Sire\, n. [F. sire, originally, an older person. See
   {Sir}.]
   1. A lord, master, or other person in authority. See {Sir}.
      [Obs.]

            Pain and distress, sickness and ire, And melancholy
            that angry sire, Be of her palace senators. --Rom.
                                                  of R.

   2. A tittle of respect formerly used in speaking to elders
      and superiors, but now only in addressing a sovereign.

   3. A father; the head of a family; the husband.

            Jankin thet was our sire [i.e., husband]. --Chaucer.

            And raise his issue, like a loving sire. --Shak.

   4. A creator; a maker; an author; an originator.

            [He] was the sire of an immortal strain. --Shelley.

   5. The male parent of a beast; -- applied especially to
      horses; as, the horse had a good sire.

   Note: Sire is often used in composition; as in grandsire,
         grandfather; great-grandsire, great-grandfather.

Sire \Sire\, v. t. [imp. & p. p. {Sired}; p. pr. & vb. n.
   {Siring}.]
   To beget; to procreate; -- used of beasts, and especially of
   stallions.

Source : WordNet®

sire
     n 1: a title of address formerly used for a man of rank and
          authority
     2: the founder of a family; "keep the faith of our forefathers"
        [syn: {forefather}, {father}]
     3: male parent of an animal especially a domestic animal such
        as a horse

sire
     v : make children; "Abraham begot Isaac"; "Men often father
         children but don't recognize them" [syn: {beget}, {get},
         {engender}, {father}, {mother}, {generate}, {bring forth}]