Source : Webster's Revised Unabridged Dictionary (1913)

President \Pres"i*dent\, n.
   Precedent. [Obs.] --Bacon.

President \Pres"i*dent\, a.
   Occupying the first rank or chief place; having the highest
   authority; presiding. [R.]

         His angels president In every province.  --Milton.

President \Pres"i*dent\, n. [F. pr['e]sident, L. praesidens,
   -entis, p. pr. of praesidere. See {Preside}.]
   1. One who is elected or appointed to preside; a presiding
      officer, as of a legislative body. Specifically:
      (a) The chief officer of a corporation, company,
          institution, society, or the like.
      (b) The chief executive officer of the government in
          certain republics; as, the president of the United
          States.

   2. A protector; a guardian; a presiding genius. [Obs.]

            Just Apollo, president of verse.      --Waller.

Source : WordNet®

president
     n 1: an executive officer of a firm or corporation
     2: the person who holds the office of head of state of the
        United States government; "the President likes to jog
        every morning" [syn: {President of the United States}, {United
        States President}, {Chief Executive}]
     3: the chief executive of a republic
     4: the officer who presides at the meetings of an organization;
        "address your remarks to the chairperson" [syn: {chairman},
         {chairwoman}, {chair}, {chairperson}]
     5: the head administrative officer of a college or university
        [syn: {prexy}]
     6: the office of the United States head of state; "a President
        is elected every four years" [syn: {President of the
        United States}, {Chief Executive}]