Adjective

1. Of or pertaining to Acadia, its people, or their language or culture.
2. Of or pertaining to the Acadian epoch.

Proper noun

1. Acadian French: the form of French spoken in Acadia.

   In many places, Acadian has been supplanted by English and by Standard French.

2. Acadian epoch: the Middle Cambrian.

   The Burgess Shale contains fossils of very odd organisms that lived during the Acadian.