The Collaborative International Dictionary of English v.0.48:

Olympian \O*lym"pi*an\ ([-o]*l[i^]m"p[i^]*an), a. [L. See 1st
   Olympian, n.]
   Pertaining to, characteristic of, or fitting for one of the
   gods on Olympus; grand, majestic, or aloof.
   [PJC]

The Collaborative International Dictionary of English v.0.48:

Olympian \O*lym"pi*an\ ([-o]*l[i^]m"p[i^]*an), Olympic
\O*lym"pic\ ([-o]*l[i^]m"p[i^]k), a. [L. Olympius, Olympicus,
   Gr. 'Oly`mpios, 'Olympiko`s, fr. 'O`lympos: cf. F. olympique.
   See Olympiad.]
   Of or pertaining to Olympus, a mountain of Thessaly, fabled
   as the seat of the gods, or to Olympia, a small plain in
   Elis.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Olympian \O*lym"pi*an\ ([-o]*l[i^]m"p[i^]*an), prop. n. [L. See
   1st Olympian, a.]
   A god who dwells on Olympus.
   [PJC]

   2. An inhabitant of Olympia.
      [PJC]

   3. An athlete who competes in the Olympics.
      [PJC]

WordNet (r) 3.0 (2006):

Olympian
    adj 1: of the region of Olympia in Greece or its inhabitants;
           "Olympian plain" [syn: Olympian, Olympic]
    2: of or pertaining to the greater gods of ancient Greece whose
       abode was Mount Olympus; "Olympian deities"
    3: majestic in manner or bearing; superior to mundane matters;
       "his majestic presence"; "olympian detachment"; "olympian
       beauty and serene composure" [syn: majestic, olympian]
    4: far beyond what is usual in magnitude or degree; "a night of
       exceeding darkness"; "an exceptional memory"; "olympian
       efforts to save the city from bankruptcy"; "the young
       Mozart's prodigious talents" [syn: exceeding,
       exceptional, olympian, prodigious, surpassing]
    n 1: an athlete who participates in the Olympic games
    2: a classical Greek god after the overthrow of the Titans [syn:
       Olympian, Olympic god]

Moby Thesaurus II by Grady Ward, 1.0:

149 Moby Thesaurus words for "Olympian":
   Elysian, Laodicean, above all that, aerial, airy, aloof,
   altitudinous, apathetic, ascending, aspiring, backward, bashful,
   beatific, beatified, benumbed, blah, blank, blase, blessed, candid,
   celestial, chilled, chilly, cold, colossal, comatose, constrained,
   cool, desensitized, detached, discreet, disinterested,
   dispassionate, distant, dominating, dull, elevated, eminent,
   ethereal, exalted, exclusive, expressionless, extramundane,
   extraterrestrial, forbidding, frigid, from on high, frosty,
   glorified, guarded, haughty, heartless, heavenly, hebetudinous,
   high, high-pitched, high-reaching, high-set, high-up, hopeless,
   icy, impartial, impassive, impersonal, in a stupor, in glory,
   inaccessible, indifferent, insouciant, introverted, languid,
   lethargic, listless, lofty, modest, monumental, mounting, neutral,
   nonchalant, numb, numbed, offish, otherworldly, outtopping,
   overlooking, overtopping, paradisaic, paradisal, paradisiac,
   paradisic, passive, phlegmatic, pluckless, prominent, remote,
   removed, repressed, reserved, resigned, restrained, reticent,
   retiring, seclusive, selfless, shrinking, slack, sluggish, soaring,
   soporific, spiring, spiritless, spunkless, standoff, standoffish,
   steep, stoic, stupefied, subdued, sublime, superlative, supernal,
   supine, suppressed, topless, toplofty, topping, torpid, towering,
   towery, transcendental, transmundane, unaffable, unapproachable,
   unbiased, uncaring, unconcerned, uncongenial, undemonstrative,
   unearthly, unexpansive, ungenial, uninfluenced, uninterested,
   unselfish, unswayed, unworldly, uplifted, upreared, withdrawn



The Devil's Dictionary (1881-1906):

OLYMPIAN, adj.  Relating to a mountain in Thessaly, once inhabited by
gods, now a repository of yellowing newspapers, beer bottles and
mutilated sardine cans, attesting the presence of the tourist and his
appetite.

    His name the smirking tourist scrawls
    Upon Minerva's temple walls,
    Where thundered once Olympian Zeus,
    And marks his appetite's abuse.
                                                           Averil Joop