Source : Webster's Revised Unabridged Dictionary (1913)

Director \Di*rect"or\, n. [Cf. F. directeur.]
   1. One who, or that which, directs; one who regulates,
      guides, or orders; a manager or superintendent.

            In all affairs thou sole director.    --Swift.

   2. One of a body of persons appointed to manage the affairs
      of a company or corporation; as, the directors of a bank,
      insurance company, or railroad company.

            What made directors cheat in South-Sea year? --Pope.

   3. (Mech.) A part of a machine or instrument which directs
      its motion or action.

   4. (Surg.) A slender grooved instrument upon which a knife is
      made to slide when it is wished to limit the extent of
      motion of the latter, or prevent its injuring the parts
      beneath.

Source : WordNet®

director
     n 1: someone who controls resources and expenditures [syn: {manager},
           {managing director}]
     2: member of a board of directors
     3: someone who supervises the actors and directs the action in
        the production of a show [syn: {theater director}, {theatre
        director}]
     4: the person who leads a musical group [syn: {conductor}, {music
        director}]