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]

Moby Thesaurus II by Grady Ward, 1.0:

196 Moby Thesaurus words for "outlaw":
   DP, Ishmael, Judas, Uitlander, abstract, actionable,
   against the law, alien, anarchic, anarchistic, anomic, bad guy,
   bad person, badman, ban, bandit, banish, bar, barbarian, betrayer,
   black-market, blackball, blacklist, bootleg, boycott, brigand,
   cast off, cast out, castaway, chargeable, chuck, clear, clear away,
   clear out, clear the decks, contraband, contrary to law, convict,
   criminal, crook, cut, cut out, debar, deceiver, declasse,
   delinquent, deny, deport, deracine, derelict, desperado,
   desperate criminal, disallow, disfellowship, displaced person,
   dispose of, double-dealer, eject, elide, eliminate, embargo,
   emigre, enjoin, eradicate, evictee, evildoer, exclude,
   exclude from, excommunicate, exile, expatriate, expel, expellee,
   extradite, felon, felonious, flawed, footpad, forbid,
   foreign devil, foreigner, fugitate, fugitive, gallows bird,
   gangster, gaolbird, get quit of, get rid of, get shut of, gringo,
   gunman, gunslinger, highwayman, illegal, illegitimate, illicit,
   impermissible, inhibit, interdict, irregular, jailbird,
   justiciable, lawbreaker, lawless, leper, liquidate, malefactor,
   malevolent, malfeasant, malfeasor, misfeasor, mobster,
   nonconstitutional, nonlegal, nonlicit, ostracize, outcast,
   outcast of society, outcaste, outlander, outlawed, outsider,
   pariah, persona non grata, picaroon, pick out, pirate, preclude,
   prevent, prohibit, proscribe, public enemy, punishable, purge,
   quisling, racketeer, refugee, refuse, reject, relegate, remove,
   renegade, repress, robber, root out, root up, rule out, rusticate,
   say no to, scofflaw, send away, send down, send to Coventry,
   shut out, sinner, snub, social outcast, spurn, stranger,
   strike off, strike out, suppress, swindler, taboo,
   the Wandering Jew, thief, throw over, throw overboard, thrust out,
   thug, traitor, tramontane, transgressor, transport, triable,
   two-timer, ultramontane, unacceptable person, unallowed,
   unauthorized, unconstitutional, under-the-counter, under-the-table,
   undesirable, unlawful, unofficial, unstatutory, untouchable,
   unwarrantable, unwarranted, villain, wanderer, weed out,
   worker of ill, wrongdoer, wrongful



Bouvier's Law Dictionary, Revised 6th Ed (1856):

OUTLAW, Eng. law. One who is put out of the protection or aid of the law.
22 Vin. Ab. 316; 1 Phil. Ev. Index, h.t.; Bac. Ab. Outlawry; 2 Sell. Pr.
277; Doct. Pl. 331; 3 Bl. Com. 283, 4.