The Collaborative International Dictionary of English v.0.48:

Plain \Plain\, a. [Compar. Plainer; superl. Plainest.] [F.,
   level, flat, fr. L. planus, perhaps akin to E. floor. Cf.
   Llano, Piano, Plan, Plane level, a level surface.]
   1. Without elevations or depressions; flat; level; smooth;
      even. See Plane.
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            The crooked shall be made straight, and the rough
            places plain.                         --Isa. xl. 4.
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   2. Open; clear; unencumbered; equal; fair.
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            Our troops beat an army in plain fight. --Felton.
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   3. Not intricate or difficult; evident; manifest; obvious;
      clear; unmistakable. "'T is a plain case." --Shak.
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   4.
      (a) Void of extraneous beauty or ornament; without
          conspicious embellishment; not rich; simple.
      (b) Not highly cultivated; unsophisticated; free from show
          or pretension; simple; natural; homely; common. "Plain
          yet pious Christians." --Hammond. "The plain people."
          --A. Lincoln.
      (c) Free from affectation or disguise; candid; sincere;
          artless; honest; frank. "An honest mind, and plain."
          --Shak.
      (d) Not luxurious; not highly seasoned; simple; as, plain
          food.
      (e) Without beauty; not handsome; homely; as, a plain
          woman.
      (f) Not variegated, dyed, or figured; as, plain muslin.
      (g) Not much varied by modulations; as, a plain tune.
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   Plain battle, open battle; pitched battle. [Obs.]
      --Chaucer.

   Plain chant (Mus.) Same as Plain song, below.

   Plain chart (Naut.), a chart laid down on Mercator's
      projection.

   Plain dealer.
      (a) One who practices plain dealing.
      (b) A simpleton. [Obs.] --Shak.

   Plain dealing. See under Dealing.

   Plain molding (Join.), molding of which the surfaces are
      plain figures.

   Plain sewing, sewing of seams by simple and common
      stitches, in distinct from fancy work, embroidery, etc.;
      -- distinguished also from designing and fitting garments.


   Plain song.
      (a) The Gregorian chant, or canto fermo; the prescribed
          melody of the Roman Catholic service, sung in unison,
          in tones of equal length, and rarely extending beyond
          the compass of an octave.
      (b) A simple melody.

   Plain speaking, plainness or bluntness of speech.
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   Syn: Level; flat; smooth; open; artless; unaffected;
        undisguised; frank; sincere; honest; candid; ingenuous;
        unembellished; downright; blunt; clear; simple;
        distinct; manifest; obvious; apparent. See Manifest.
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The Collaborative International Dictionary of English v.0.48:

Dealing \Deal"ing\, n.
   The act of one who deals; distribution of anything, as of
   cards to the players; method of business; traffic;
   intercourse; transaction; as, to have dealings with a person.
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   Double dealing, insincere, treacherous dealing; duplicity.


   Plain dealing, fair, sincere, honorable dealing; honest,
      outspoken expression of opinion.
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U.S. Gazetteer Places (2000):

Plain Dealing, LA -- U.S. town in Louisiana
   Population (2000):    1071
   Housing Units (2000): 481
   Land area (2000):     1.591456 sq. miles (4.121851 sq. km)
   Water area (2000):    0.004631 sq. miles (0.011995 sq. km)
   Total area (2000):    1.596087 sq. miles (4.133846 sq. km)
   FIPS code:            60670
   Located within:       Louisiana (LA), FIPS 22
   Location:             32.905898 N, 93.699896 W
   ZIP Codes (1990):     71064
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Plain Dealing, LA
    Plain Dealing