The Collaborative International Dictionary of English v.0.48:

Corinthian \Co*rin"thi*an\, n.
   1. A native or inhabitant of Corinth.
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   2. A gay, licentious person. [Obs.]
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   3. A man of fashion given to pleasuring or sport; a
      fashionable man about town; esp., a man of means who
      drives his own horse, sails his own yacht, or the like.
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Corinthian \Co*rin"thi*an\ (-an), a.
   1. Of or relating to Corinth.
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   2. (Arch.) Of or pertaining to the Corinthian order of
      architecture, invented by the Greeks, but more commonly
      used by the Romans.
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            This is the lightest and most ornamental of the
            three orders used by the Greeks.      --Parker.
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   3. Debauched in character or practice; impure. --Milton.
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   4. Of or pertaining to an amateur sailor or yachtsman; as, a
      corinthian race (one in which the contesting yachts must
      be manned by amateurs.)
      [1913 Webster]

WordNet (r) 3.0 (2006):

corinthian
    adj 1: or pertaining to the Corinthian style of architecture
    2: of or relating to or characteristic of Corinth or its
       inhabitants
    n 1: a man devoted to the pursuit of pleasure [syn: playboy,
         man-about-town, Corinthian]
    2: a resident of Corinth