1. a rich mass of ore, as found in mining.
  2. a source of great and sudden wealth or luck; a spectacular windfall: The play proved to be a bonanza for its lucky backers.


  1. a source, usually sudden and unexpected, of luck or wealth
  2. US and Canadian a mine or vein rich in ore

1844, American English, from Spanish bonanza “a rich lode,” originally “fair weather at sea, prosperity,” from Vulgar Latin *bonacia, from Latin bonus “good” (see bene-).

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