The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   2. To scheme; to devise; to contrive; to form in design; as,
      to plan the conquest of a country.
      [1913 Webster]

            Even in penance, planning sins anew.  --Goldsmith.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   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.
      [1913 Webster]

            God's plans like lines pure and white unfold. --M.
                                                  R. Smith.
      [1913 Webster]

   3. A method; a way of procedure; a custom.
      [1913 Webster]

            The simple plan,
            That they should take who have the power,
            And they should keep who can.         --Wordsworth.
      [1913 Webster]

   Body plan, Floor plan, etc. See under Body, Floor,
      etc.
      [1913 Webster]

   Syn: Scheme; draught; delineation; plot; sketch; project;
        design; contrivance; device. See Scheme.
        [1913 Webster]

WordNet (r) 3.0 (2006):

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: plan,
         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, plan]
    3: scale drawing of a structure; "the plans for City Hall were
       on file" [syn: plan, architectural 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: plan, 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: plan, 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, plan]

Moby Thesaurus II by Grady Ward, 1.0:

365 Moby Thesaurus words for "plan":
   action, adjust, affair, aim, aim at, alphabet, ambition,
   anagnorisis, anatomy, angle, animus, anticipate, approach,
   architectonics, architecture, argument, arrange, arrangement, art,
   aspiration, aspire after, aspire to, atmosphere, attempt, await,
   background, be after, be destined, be fated, be imminent, be to be,
   be to come, beget, blueprint, breed, bring forth, bring into being,
   build, building, business, calculate, call into being, cast,
   catalog, catalogue raisonne, catastrophe, charactering,
   characterization, chart, choreography, clear for action,
   clear the decks, codify, coin, color, come, come on, commitment,
   complication, composition, conceive, conception, concert, concoct,
   conformation, constitution, construction, contemplate, continuity,
   contract, contrivance, contrive, conventional representation,
   cook up, coordinate, counsel, course of action, creation, cure,
   cut out, dance notation, deal, delineate, delineation,
   demonstration, denouement, depiction, depictment, deploy,
   desideration, desideratum, design, desire, destine, determination,
   determine, develop, development, device, devise, diagram, discover,
   drama, draw near, draw on, drawing, dream up, dress, drive at,
   effect, effort, engagement, engender, enterprise, envisage,
   envision, episode, evolve, exemplification, expect, fable, fabric,
   fabricate, fabrication, falling action, fashion, fashioning,
   figuration, figure, fix, fix up, fixed purpose, forecast, foresee,
   foretell, forethink, forging, form, format, formation, formula,
   frame, frame up, function, game plan, generate, get ready, getup,
   gimmick, give being to, give rise to, go for, graph, ground plan,
   harbor a design, harmonize, hatch, have every intention,
   hieroglyphic, hope, iconography, idea, ideogram, illustration,
   imagery, imaging, improvise, incident, intend, intendment, intent,
   intention, invent, lay down, lay out, lay plans, layout, letter,
   lie ahead, limning, line, local color, logogram, logograph,
   look for, look forward to, loom, make, make a projection,
   make arrangements, make do with, make preparations, make ready,
   make up, makeup, making, manufacture, map, map out, mature, mean,
   meaning, means, method, methodize, mind, mint, mobilize, mold,
   molding, mood, motif, motive, movement, musical notation, mythos,
   near, nisus, normalize, notation, notion, object, obligation,
   operation, orderliness, organic structure, organism, organization,
   organize, originate, outline, pack, pack the deal, pattern,
   patterning, peripeteia, physique, pictogram, picturization,
   plan ahead, platform, plot, point, policy, portraiture, portrayal,
   prearrange, preconcert, preconsider, precontrive, predesign,
   predetermine, predict, prefigurement, premeditate, preorder, prep,
   prepare, preresolve, presentment, pretreat, printing, procedure,
   process, procreate, production, program, project, projection,
   prophesy, proposal, propose, proposition, prospectus, provide,
   purport, purpose, put in shape, rationalize, ready, ready up,
   realization, recognition, regularize, regulate, rendering,
   rendition, representation, resolution, resolve, rig, rising action,
   routinize, sake, scenario, schedule, schema, schematize, scheme,
   score, script, secondary plot, set, set up, settle,
   settle preliminaries, setup, sew up, shape, shaping, sketch, slant,
   spawn, stack the cards, standardize, story, strategy, strike out,
   striving, structure, structuring, study, subject, subplot, switch,
   syllabary, symbol, synchronize, system, systematize, tablature,
   table, table of contents, tan, task, tectonics, texture,
   thematic development, theme, think, think out, think up, threaten,
   tissue, tone, topic, treat, trim, try out, tune, tune up, twist,
   undertaking, venture, view, warp and woof, way, weave, web, will,
   work, work out, work out beforehand, work up, writing



The Free On-line Dictionary of Computing (30 December 2018):

PLAN

    Programming LANguage Nineteen hundred.

   The assembly language for ICL 1900 series computers.

   (1995-03-21)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

PLAN. The delineation or design of a city, a house or houses, a garden, a
vessel, &c. traced on paper or other substance, representing the position,
and the relative proportions of the different parts.
     2. When houses are built by one person agreeably to a plan, and one of
them is Sold to a person, with windows and doors in it, the owner of the
others cannot shut up those windows, nor has his grantee any greater right.
1 Price, R. 27; 2 Ry. & Mo. 24; 1 Lev. 122; 2 Saund. 114, n. 4 1 M. & M.
396; 9 Bing 305; 1 Leigh's N. P. 559. See 12 Mass: 159; Hamm. N. P. 202; 2
Hill. Ab. c. 12, n. 6 to 12; Com. Dig. Action on the case for a nuisance, A.
See Ancients Lights; Windows.



The Devil's Dictionary (1881-1906):

PLAN, v.t.  To bother about the best method of accomplishing an
accidental result.