The Collaborative International Dictionary of English v.0.48:

Entitle \En*ti"tle\, v. t. [imp. & p. p. Entitled; p. pr. &
   vb. n. Entitling.] [OF. entituler, F. intituler, LL.
   intitulare, fr. L. in + titulus title. See Title, and cf.
   Intitule.]
   1. To give a title to; to affix to as a name or appellation;
      hence, also, to dignify by an honorary designation; to
      denominate; to call; as, to entitle a book "Commentaries;"
      to entitle a man "Honorable."
      [1913 Webster]

            That which . . . we entitle patience. --Shak.
      [1913 Webster]

   2. To give a claim to; to qualify for, with a direct object
      of the person, and a remote object of the thing; to
      furnish with grounds for seeking or claiming with success;
      as, an officer's talents entitle him to command.
      [1913 Webster]

   3. To attribute; to ascribe. [Obs.]
      [1913 Webster]

            The ancient proverb . . . entitles this work . . .
            peculiarly to God himself.            --Milton.

   Syn: To name; designate; style; characterize; empower;
        qualify; enable; fit.
        [1913 Webster]

WordNet (r) 3.0 (2006):

entitled
    adj 1: qualified for by right according to law; "we are all
           entitled to equal protection under the law"

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "entitled":
   ascribable, attributable, authorized, chartered, deserved,
   deserving, due, earned, empowered, enfranchised, entitled to,
   franchised, justified, licensed, merited, meriting, meritorious,
   patented, privileged, qualified, sanctioned, warranted,
   well-earned, worthy, worthy of