The Collaborative International Dictionary of English v.0.48:

Enable \En*a"ble\, v. t. [imp. & p. p. Enabled; p. pr. & vb.
   n. Enabling.]
   1. To give strength or ability to; to make firm and strong.
      [Obs.] "Who hath enabled me." --1 Tim. i. 12.
      [1913 Webster]

            Receive the Holy Ghost, said Christ to his apostles,
            when he enabled them with priestly power. --Jer.
                                                  Taylor.
      [1913 Webster]

   2. To make able (to do, or to be, something); to confer
      sufficient power upon; to furnish with means,
      opportunities, and the like; to render competent for; to
      empower; to endow.
      [1913 Webster]

            Temperance gives Nature her full play, and enables
            her to exert herself in all her force and vigor.
                                                  --Addison.
      [1913 Webster]

WordNet (r) 3.0 (2006):

enable
    v 1: render capable or able for some task; "This skill will
         enable you to find a job on Wall Street"; "The rope enables
         you to secure yourself when you climb the mountain" [ant:
         disable, disenable, incapacitate]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "enable":
   OK, accredit, adapt, adjust, agree to, aid, allow, approve, arm,
   assent to, assign, assist, attune, authorize, capacitate,
   certificate, certify, charter, clothe, clothe with power,
   commission, condition, delegate, depute, deputize, empower, endow,
   endue, enfranchise, entitle, entrust, equip, expedite, facilitate,
   fit, franchise, furnish, give official sanction, give power,
   go along with, help, invest, legalize, legitimize, let, license,
   make possible, okay, patent, permit, prepare, privilege,
   put in trim, put in tune, qualify, ratify, ready, sanction, suit,
   tune, validate, warrant