The Collaborative International Dictionary of English v.0.48:

Eligible \El"i*gi*ble\, a. [F. ['e]ligible, fr. L. eligere. See
   Elect.]
   1. That may be selected; proper or qualified to be chosen;
      legally qualified to be elected and to hold office.
      [1913 Webster]

   2. Worthy to be chosen or selected; suitable; desirable; as,
      an eligible situation for a house.
      [1913 Webster]

            The more eligible of the two evils.   --Burke.
      [1913 Webster]

WordNet (r) 3.0 (2006):

eligible
    adj 1: qualified for or allowed or worthy of being chosen;
           "eligible to run for office"; "eligible for retirement
           benefits"; "an eligible bachelor" [ant: ineligible]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "eligible":
   acceptability, acceptable, admissible, appropriate, available,
   capable, desirability, desirable, eligibility, enfranchised, fit,
   fitness, fitted, fittedness, fitting, likely, marriageable, nubile,
   preferable, proper, qualification, qualified, seemly, single,
   suitability, suitable, suited, unmarried, unwed, with voice,
   with vote, worthiness, worthy