The Collaborative International Dictionary of English v.0.48:

Hesperian \Hes*pe"ri*an\, a. [L. hesperius, fr. hesperus the
   evening star, Gr. ? evening, ? ? the evening star. Cf.
   Vesper.]
   Western; being in the west; occidental. [Poetic] --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hesperian \Hes*pe"ri*an\, n.
   A native or an inhabitant of a western country. [Poetic] --J.
   Barlow.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hesperian \Hes*pe"ri*an\, a. (Zool.)
   Of or pertaining to a family of butterflies called
   Hesperid[ae], or skippers. -- n. Any one of the numerous
   species of Hesperidae; a skipper.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Hesperian
    adj 1: denoting or characteristic of countries of Europe and the
           western hemisphere; "occidental civilization"; "Hesperian
           culture" [syn: occidental, Hesperian]