Board Thread:Lore Discussion/@comment-14057152-20140313225928/@comment-4705438-20140314002212

Aedra and Daedra are not as different as you think. It's a term for "ancestor" and "not-ancestor", beings themselves not being so different.

Meridia might have been with the Magnus and the crew of other lesser escaping Aedra. And I remember reading that she got somehow involved with Mehrunes, which is why she was "banished". Either way, she is certainly an Anuic diety.