Source : Webster's Revised Unabridged Dictionary (1913)

Rector \Rec"tor\ (r?k"t?r), n. [L., fr. regere, rectum, to lead
   straight, to rule: cf. F. recteur. See {Regiment}, {Right}.]
   1. A ruler or governor. [R.]

            God is the supreme rector of the world. --Sir M.
                                                  Hale.

   2.
      (a) (Ch. of Eng.) A clergyman who has the charge and cure
          of a parish, and has the tithes, etc.; the clergyman
          of a parish where the tithes are not impropriate. See
          the Note under Vicar. --Blackstone.
      (b) (Prot. Epis. Ch.) A clergyman in charge of a parish.

   3. The head master of a public school. [Scot.]

   4. The chief elective officer of some universities, as in
      France and Scotland; sometimes, the head of a college; as,
      the Rector of Exeter College, or of Lincoln College, at
      Oxford.

   5. (R.C.CH.) The superior officer or chief of a convent or
      religious house; and among the Jesuits the superior of a
      house that is a seminary or college.

Source : WordNet®

rector
     n : a person authorized to conduct religious worship [syn: {curate},
          {minister}, {parson}, {pastor}]