Source : Webster's Revised Unabridged Dictionary (1913)

Acadian \A*ca"di*an\, a.
   Of or pertaining to Acadie, or Nova Scotia. ``Acadian
   farmers.'' --Longfellow. -- n. A native of Acadie.

   {Acadian epoch} (Geol.), an epoch at the beginning of the
      American paleozoic time, and including the oldest American
      rocks known to be fossiliferous. See {Geology}.

   {Acadian owl} (Zo["o]l.), a small North American owl
      ({Nyctule Acadica}); the saw-whet.

Source : WordNet®

Acadian
     n : an early French settler in the Maritimes