The Collaborative International Dictionary of English v.0.48:

President \Pres"i*dent\, n.
   Precedent. [Obs.] --Bacon.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

President \Pres"i*dent\, a.
   Occupying the first rank or chief place; having the highest
   authority; presiding. [R.]
   [1913 Webster]

         His angels president
         In every province.                       --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
          [1913 Webster]

   2. A protector; a guardian; a presiding genius. [Obs.]
      [1913 Webster]

            Just Apollo, president of verse.      --Waller.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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, 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: president,
       chairman, chairwoman, chair, chairperson]
    5: the head administrative officer of a college or university
       [syn: president, prexy]
    6: the office of the United States head of state; "a President
       is elected every four years" [syn: President of the United
       States, President, Chief Executive]

The Devil's Dictionary (1881-1906):

PRESIDENT, n.  The leading figure in a small group of men of whom --
and of whom only -- it is positively known that immense numbers of
their countrymen did not want any of them for President.

    If that's an honor surely 'tis a greater
    To have been a simple and undamned spectator.
    Behold in me a man of mark and note
    Whom no elector e'er denied a vote! --
    An undiscredited, unhooted gent
    Who might, for all we know, be President
    By acclimation.  Cheer, ye varlets, cheer --
    I'm passing with a wide and open ear!
                                                        Jonathan Fomry