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):

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

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "Frigg":
   Aesir, Balder, Bor, Bori, Bragi, Donar, Forseti, Frey, Freya,
   Freyja, Freyr, Frigga, Heimdall, Hel, Hera, Hertha, Hoenir, Hymen,
   Idun, Ing, Ithunn, Juno, Loki, Nanna, Nerthus, Njord, Njorth, Odin,
   Pronuba, Reimthursen, Sif, Sigyn, Teleia, Thor, Tiu, Tyr, Ull,
   Ullr, Vali, Vanir, Vidar, Vitharr, Wayland, Weland, Woden, Wotan,
   Wyrd