Atlantaic was a language spoken by three human tribes of the east Kastuvoita plains - Sakermidë, Daronidë, and Kadimidë. It was mostly spoken in the period before the Battle of Tor Minnen. Afterwards, the Kingdom of Dernedd (the main human kingdom in that area) started publishing decrees in 'Classical Daronidic' a descendent of Atlantaic.
Besides being the name of the language, Atlantaic can be used to describe the entire culture of these three tribes. For this usage, see Atlantaic Culture.