The Collaborative International Dictionary of English v.0.48:

Grecian \Gre"cian"\, a. [Cf. Greek.]
   Of or pertaining to Greece; Greek.
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   Grecian bend, among women, an affected carriage of the
      body, the upper part being inclined forward. [Collog.]

   Grecian fire. See Greek fire, under Greek.
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The Collaborative International Dictionary of English v.0.48:

Grecian \Gre"cian\, n.
   1. A native or naturalized inhabitant of Greece; a Greek.
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   2. A jew who spoke Greek; a Hellenist. --Acts vi. 1.
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   Note: The Greek word rendered Grecian in the Authorized
         Version of the New Testament is translated Grecian Jew
         in the Revised Version.
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   6. One well versed in the Greek language, literature, or
      history. --De Quincey.
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WordNet (r) 3.0 (2006):

Grecian
    adj 1: of or relating to or characteristic of Greece or the
           Greeks or the Greek language; "Greek mythology"; "a
           Grecian robe" [syn: Greek, Grecian, Hellenic]
    n 1: a native or resident of Greece