The Collaborative International Dictionary of English v.0.48:

Outlaw \Out"law`\ (out"l[add]`), n. [AS. [=u]tlaga, [=u]tlah.
   See Out, and Law.]
   1. A person excluded from the benefit of the law, or deprived
      of its protection. --Blackstone.
      [1913 Webster]

   2. A person engaging habitually in criminal activity,
      especially theft or robbery; an habitually lawless person,
      especially one who is a fugitive from the law.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Outlaw \Out"law`\, v. t. [imp. & p. p. Outlawed; p. pr. & vb.
   n. Outlawing.] [AS. ?tlagian.]
   [1913 Webster]
   1. To deprive of the benefit and protection of law; to
      declare to be an outlaw. --Blackstone.
      [1913 Webster]

   2. To remove from legal jurisdiction or enforcement; as, to
      outlaw a debt or claim; to deprive of legal force. "Laws
      outlawed by necessity." --Fuller.
      [1913 Webster]

   3. To render illegal; to ban, prohibit, or proscribe under
      sanction of some penalty.
      [PJC]

WordNet (r) 3.0 (2006):

outlaw
    adj 1: contrary to or forbidden by law; "an illegitimate seizure
           of power"; "illicit trade"; "an outlaw strike"; "unlawful
           measures" [syn: illegitimate, illicit, outlaw(a),
           outlawed, unlawful]
    2: disobedient to or defiant of law; "lawless bands roaming the
       plains" [syn: lawless, outlaw(a)]
    n 1: someone who has committed a crime or has been legally
         convicted of a crime [syn: criminal, felon, crook,
         outlaw, malefactor]
    v 1: declare illegal; outlaw; "Marijuana is criminalized in the
         U.S." [syn: outlaw, criminalize, criminalise,
         illegalize, illegalise] [ant: decriminalise,
         decriminalize, legalise, legalize, legitimate,
         legitimatise, legitimatize, legitimise, legitimize]