Source : Webster's Revised Unabridged Dictionary (1913)

Plan \Plan\, n. [F., fr. L. planus flat, level. See {Plain}, a.]
   1. A draught or form; properly, a representation drawn on a
      plane, as a map or a chart; especially, a top view, as of
      a machine, or the representation or delineation of a
      horizontal section of anything, as of a building; a
      graphic representation; a diagram.

   2. A scheme devised; a method of action or procedure
      expressed or described in language; a project; as, the
      plan of a constitution; the plan of an expedition.

            God's plans like lines pure and white unfold. --M.
                                                  R. Smith.

   3. A method; a way of procedure; a custom.

            The simple plan, That they should take who have the
            power, And they should keep who can.  --Wordsworth.

   {Body plan}, {Floor plan}, etc. See under {Body}, {Floor},
      etc.

   Syn: Scheme; draught; delineation; plot; sketch; project;
        design; contrivance; device. See {Scheme}.

Plan \Plan\, v. t. [imp. & p. p. {Planned}; p. pr. & vb. n.
   {Planning}.]
   1. To form a delineation of; to draught; to represent, as by
      a diagram.

   2. To scheme; to devise; to contrive; to form in design; as,
      to plan the conquest of a country.

            Even in penance, planning sins anew.  --Goldsmith.

Source : WordNet®

plan
     n 1: a series of steps to be carried out or goals to be
          accomplished; "they drew up a six-step plan"; "they
          discussed plans for a new bond issue" [syn: {program}, {programme}]
     2: an arrangement scheme; "the awkward design of the keyboard
        made operation difficult"; "it was an excellent design for
        living"; "a plan for seating guests" [syn: {design}]
     3: scale drawing of a structure; "the plans for City Hall were
        on file" [syn: {architectural plan}]
     [also: {planning}, {planned}]

plan
     v 1: have the will and intention to carry out some action; "He
          plans to be in graduate school next year"; "The rebels
          had planned turmoil and confusion" [syn: {be after}]
     2: make plans for something; "He is planning a trip with his
        family"
     3: make or work out a plan for; devise; "They contrived to
        murder their boss"; "design a new sales strategy"; "plan
        an attack" [syn: {project}, {contrive}, {design}]
     4: make a design of; plan out in systematic, often graphic
        form; "design a better mousetrap"; "plan the new wing of
        the museum" [syn: {design}]
     [also: {planning}, {planned}]

Source : Free On-Line Dictionary of Computing

PLAN
     
         Programming LANguage Nineteen hundred.
     
        The {assembly language} for {ICL 1900} series computers.
     
        (1995-03-21)

.plan
     
         See {plan file}.