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]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "president":
   academic dean, administration, administrator, archon, chancellor,
   chief executive, chief executive officer, chief of state, dean,
   dean of men, dean of women, dewan, doge, executive,
   executive director, executive officer, executive secretary,
   grand vizier, head of state, headmaster, headmistress, magistrate,
   management, managing director, master, officer, official, prefect,
   premier, prexy, prime minister, principal, provost, rector,
   secretary, the administration, treasurer, vice-chancellor,
   vice-president, warden



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