The Collaborative International Dictionary of English v.0.48:

Prestigious \Pres*tig"i*ous\, a. [L. praestigiosus.]
   Practicing tricks; juggling. [Obs.] --Cotton Mather.
   [1913 Webster]

WordNet (r) 3.0 (2006):

prestigious
    adj 1: having an illustrious reputation; respected; "our
           esteemed leader"; "a prestigious author" [syn:
           esteemed, honored, prestigious]
    2: exerting influence by reason of high status or prestige; "a
       prestigious professor at a prestigious university"

Moby Thesaurus II by Grady Ward, 1.0:

125 Moby Thesaurus words for "prestigious":
   absolute, acclaimed, admired, adored, appreciated, ascendant,
   august, authoritarian, authoritative, authorized, autocratic,
   celebrated, charismatic, charming, clothed with authority,
   commanding, competent, consequential, considerable, conspicuous,
   controlling, creditable, dignified, distinguished, dominant,
   duly constituted, effective, effectual, efficacious, eminent,
   empowered, enchanting, esteemed, estimable, ex officio,
   exceptional, extraordinary, famed, famous, glamorous, glorious,
   governing, great, hegemonic, hegemonistic, held in esteem,
   held in respect, highly considered, highly esteemed,
   highly regarded, highly reputed, highly respectable, honorable,
   honored, illustrious, imperative, important, imposing, impressive,
   in favor, in good odor, in high esteem, in high favor, influential,
   leading, magnetic, marked, memorable, meritorious, mighty,
   momentous, monocratic, much-admired, noble, notable, noted,
   noteworthy, of mark, official, outstanding, personable, persuasive,
   potent, powerful, preeminent, prized, prominent, puissant, ranking,
   rare, remarkable, rememberable, renowned, reputable, respectable,
   respected, revered, reverenced, reverend, ruling, salient, senior,
   signal, significant, special, striking, strong, suasive,
   substantial, superior, supreme, telling, totalitarian,
   unforgettable, valued, venerable, venerated, weighty,
   well-considered, well-known, well-thought-of, winning, worshiped,
   worshipful, worthy