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.