Source : Webster's Revised Unabridged Dictionary (1913)

AEsir \[AE]"sir\, n. pl. [Icel., pl. of [=a]ss god.]
   In the old Norse mythology, the gods Odin, Thor, Loki,
   Balder, Frigg, and the others. Their home was called Asgard.

Source : WordNet®

Aesir
     n : (Norse mythology) the chief race of gods living at Asgard