The Collaborative International Dictionary of English v.0.48:

Pimp \Pimp\ (p[i^]mp), n. [Cf. F. pimpant smart, sparkish; perh.
   akin to piper to pipe, formerly also, to excel. Cf. Pipe.]
   One who provides gratification for the lust of others; a
   procurer; a pander. --Swift.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pimp \Pimp\, v. i. [imp. & p. p. Pimped (p[i^]mt; 215); p. pr.
   & vb. n. Pimping.]
   To procure women for the gratification of others' lusts; to
   pander. --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pimp
    n 1: someone who procures customers for whores (in England they
         call a pimp a ponce) [syn: pimp, procurer, panderer,
         pander, pandar, fancy man, ponce]
    v 1: arrange for sexual partners for others [syn: pander,
         pimp, procure]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "pimp":
   backslider, bad egg, bad lot, bawd, betrayer, black sheep, bully,
   cadet, canary, degenerate, fallen angel, fancy man, fink, gigolo,
   hustle, hustler, lecher, lost sheep, lost soul, madam, maquereau,
   miscreant, nark, pander, panderer, peach, pervert, procure,
   procurer, procuress, profligate, prostitute, rat, recidivist,
   recreant, reprobate, scapegrace, sing, snitch, solicit, sorry lot,
   squeak, squeal, stool, stoolie, trollop, white slaver, whore,
   whoremonger