The Collaborative International Dictionary of English v.0.48:

Pervert \Per*vert"\, v. t. [imp. & p. p. Perverted; p. pr. &
   vb. n. Perverting.] [F. pervertir, L. pervertere,
   perversum; per + vertere to turn. See Per-, and Verse.]
   1. To turn another way; to divert. [Obs.]
      [1913 Webster]

            Let's follow him, and pervert the present wrath.
                                                  --Shak.
      [1913 Webster]

   2. To turn from truth, rectitude, or propriety; to divert
      from a right use, end, or way; to lead astray; to corrupt;
      also, to misapply; to misinterpret intentionally; as, to
      pervert one's words. --Dryden.
      [1913 Webster]

            He, in the serpent, had perverted Eve. --Milton.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pervert \Per*vert"\, v. i.
   To become perverted; to take the wrong course. [R.]
   --Testament of Love.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pervert \Per"vert\, n.
   One who has been perverted; one who has turned to error,
   especially in religion; -- opposed to convert. See the
   Synonym of Convert.
   [1913 Webster]

         That notorious pervert, Henry of Navarre. --Thackeray.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pervert
    n 1: a person whose behavior deviates from what is acceptable
         especially in sexual behavior [syn: pervert, deviant,
         deviate, degenerate]
    v 1: corrupt morally or by intemperance or sensuality; "debauch
         the young people with wine and women"; "Socrates was
         accused of corrupting young men"; "Do school counselors
         subvert young children?"; "corrupt the morals" [syn:
         corrupt, pervert, subvert, demoralize,
         demoralise, debauch, debase, profane, vitiate,
         deprave, misdirect]
    2: practice sophistry; change the meaning of or be vague about
       in order to mislead or deceive; "Don't twist my words" [syn:
       twist, twist around, pervert, convolute,
       sophisticate]
    3: change the inherent purpose or function of something; "Don't
       abuse the system"; "The director of the factory misused the
       funds intended for the health care of his workers" [syn:
       pervert, misuse, abuse]

Moby Thesaurus II by Grady Ward, 1.0:

165 Moby Thesaurus words for "pervert":
   abuse, adulterate, alloy, argue insincerely, backslider, bad egg,
   bad lot, bastardize, befoul, belie, bias, black sheep, brutalize,
   burlesque, camouflage, canker, caricature, cheapen, coarsen, color,
   confound, contaminate, contort, convert, corrupt, debase, debauch,
   debauchee, defalcate, defile, deflect, deflower, degenerate,
   degrade, demoralize, denature, deprave, desecrate, despoil,
   devalue, deviant, deviate, disguise, distort, divert, dress up,
   embellish, embezzle, embroider, exaggerate, fallen angel, falsify,
   foul, fudge, garble, get one wrong, get wrong, gild, gloss,
   gloss over, ill-treat, infect, lead astray, lecher, lost sheep,
   lost soul, maladminister, maltreat, mask, misadvise, misapply,
   misapprehend, misappropriate, miscite, miscolor, misconceive,
   misconstrue, miscreant, misdeem, misdirect, miseducate, misemploy,
   misexplain, misexplicate, misexpound, misguide, mishandle,
   misinform, misinstruct, misinterpret, misjudge, mislead, mismanage,
   misquote, misread, misrender, misreport, misrepresent, misstate,
   mistake, misteach, mistranslate, mistreat, misunderstand, misuse,
   mystify, obfuscate, obscure, outrage, overdraw, overstate,
   paralogize, parody, peculate, pilfer, pimp, poison, pollute,
   profane, profligate, prostitute, rationalize, ravage, ravish,
   reason ill, recidivist, recreant, reprobate, ruin, scapegrace,
   seduce, sex criminal, sex fiend, sexual deviant, sexual deviate,
   sexual pervert, sexual psychopath, sidetrack, slant, sorry lot,
   squeeze, strain, strain the sense, subvert, taint, titivate,
   torture, travesty, trick out, trollop, turn aside, turn away,
   twist, twist the words, ulcerate, understate, varnish, violate,
   vitiate, vulgarize, warp, weirdo, whitewash, whore, wrench