The Collaborative International Dictionary of English v.0.48:

Solicitation \So*lic`i*ta"tion\, n. [F. sollicitation, or L.
   sollicitatio.]
   1. The act of soliciting; earnest request; persistent asking;
      importunity.
      [1913 Webster]

   2. Excitement; invitation; as, the solicitation of the
      senses. --Locke.
      [1913 Webster]

WordNet (r) 3.0 (2006):

solicitation
    n 1: an entreaty addressed to someone of superior status; "a
         solicitation to the king for relief"
    2: request for a sum of money; "an appeal to raise money for
       starving children" [syn: solicitation, appeal,
       collection, ingathering]
    3: the act of enticing a person to do something wrong (as an
       offer of sex in return for money) [syn: solicitation,
       allurement]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "solicitation":
   addresses, all-out campaign, allurement, blandishment, cajolement,
   cajolery, campaign, campaign button, campaign commitments,
   campaign contribution, campaign fund, canvass, coaxing, conning,
   courting, engagement, enlistment, exhortation,
   grass-roots campaign, hard-hitting campaign, harlotry, hortation,
   hurrah campaign, inducement, jawboning, lobbying, media campaign,
   pandering, persuasion, pimping, preaching, preachment,
   prostitution, sales talk, salesmanship, selling, snow job,
   soft soap, soliciting, streetwalking, stump excursion,
   stumping tour, suasion, suit, sweet talk, wheedling,
   whistle-stop campaign, whoredom, whoremastery, whoremonging,
   wooing, working on