Source : Webster's Revised Unabridged Dictionary (1913)

Potlatch \Pot"latch`\, n. [Chinook potlatch, pahtlatch, fr.
   Nootka pahchilt, pachalt, a gift.]
   1. Among the Kwakiutl, Chimmesyan, and other Indians of the
      northwestern coast of North America, a ceremonial
      distribution by a man of gifts to his own and neighboring
      tribesmen, often, formerly, to his own impoverishment.
      Feasting, dancing, and public ceremonies accompany it.

   2. Hence, a feast given to a large number of persons, often
      accompanied by gifts. [Colloq., Northwestern America]