The Collaborative International Dictionary of English v.0.48:

Solicitor \So*lic"it*or\, n. [F. solliciteur, L. sollicitator.]
   1. One who solicits.
      [1913 Webster]

   2. (Law)
      (a) An attorney or advocate; one who represents another in
          court; -- formerly, in English practice, the
          professional designation of a person admitted to
          practice in a court of chancery or equity. See the
          Note under Attorney.
      (b) The law officer of a city, town, department, or
          government; as, the city solicitor; the solicitor of
          the treasury.
          [1913 Webster]

WordNet (r) 3.0 (2006):

solicitor
    n 1: a petitioner who solicits contributions or trade or votes
         [syn: solicitor, canvasser]
    2: a British lawyer who gives legal advice and prepares legal
       documents

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "solicitor":
   advocate, agent, amicus curiae, applicant, aspirant, attorney,
   attorney-at-law, ballyhoo man, ballyhooer, barker, barrister,
   barrister-at-law, bidder, candidate, canvasser, claimant, counsel,
   counselor, counselor-at-law, deputy, friend at court, intercessor,
   lawyer, legal adviser, legal counselor, legal expert,
   legal practitioner, legalist, mouthpiece, petitioner, pitchman,
   pleader, postulant, proctor, procurator, sea lawyer, seeker,
   self-styled lawyer, solicitant, spieler, suitor, suppliant,
   supplicant, tout, touter