The Collaborative International Dictionary of English v.0.48:

Villain \Vil"lain\, n. [OE. vilein, F. vilain, LL. villanus,
   from villa a village, L. villa a farm. See Villa.]
   [1913 Webster]
   1. (Feudal Law) One who holds lands by a base, or servile,
      tenure, or in villenage; a feudal tenant of the lowest
      class, a bondman or servant. [In this sense written also
      villan, and villein.]
      [1913 Webster]

            If any of my ansectors was a tenant, and a servant,
            and held his lands as a villain to his lord, his
            posterity also must do so, though accidentally they
            become noble.                         --Jer. Taylor.
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   Note: Villains were of two sorts; villains regardant, that
         is, annexed to the manor (LL. adscripti glebae); and
         villains in gross, that is, annexed to the person of
         their lord, and transferable from one to another.
         --Blackstone.
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   2. A baseborn or clownish person; a boor. [R.]
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            Pour the blood of the villain in one basin, and the
            blood of the gentleman in another, what difference
            shall there be proved?                --Becon.
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   3. A vile, wicked person; a man extremely depraved, and
      capable or guilty of great crimes; a deliberate scoundrel;
      a knave; a rascal; a scamp.
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            Like a villain with a smiling cheek.  --Shak.
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            Calm, thinking villains, whom no faith could fix.
                                                  --Pope.
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The Collaborative International Dictionary of English v.0.48:

Villan \Vil"lan\, n.
   A villain. [R.]
   [1913 Webster]