a Of or pertaining to Acadia, its people, or their language or culture. (defdate|First attested in the early 19th century.)
a (context|geology) Of or pertaining to the Acadian epoch.
pn (Canada) A French speaking descendant of the early settlers in the Maritime Provinces.
pn (rare)Acadian French: the form of French spoken in Acadia.
pn A native of Acadia or their descendants who moved to Louisiana; a Cajun. (defdate|First attested in the early 18th century.)Brown, Lesley, ed. The Shorter Oxford English Dictionary. 5th. Oxford: Oxford University Press, 2003.
pn (rare)Acadian epoch; the Middle Cambrian; the geologic time period from 497 million year ago to 509 million year ago.