The Collaborative International Dictionary of English v.0.48:

Frigg \Frigg\, Frigga \Frig"ga\n. [Icel. Frigg. See Friday.]
   (Scand. Myth.)
   The wife of Odin and mother of the gods; the supreme goddess;
   the Juno of the Valhalla. Cf. Freya.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Frigga
    n 1: (Norse mythology) goddess of the heavens and married love;
         wife of Odin [syn: Frigg, Frigga]