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bonanza

[buh-nan-zuh, boh-] /bəˈnæn zə, boʊ-/
noun
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.
Origin of bonanza
1835-1845
1835-45, Americanism; < Spanish: literally, smooth sea (hence, good luck, rich vein of ore), nasalized variant of Medieval Latin bonacia, equivalent to Latin bon(us) good + (mal)acia calm sea < Greek malakía softness (malak(ós) soft + -ia -ia)
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for bonanza

bonanza

/bəˈnænzə/
noun
1.
a source, usually sudden and unexpected, of luck or wealth
2.
(US & Canadian) a mine or vein rich in ore
Word Origin
C19: from Spanish, literally: calm sea, hence, good luck, from Medieval Latin bonacia, from Latin bonus good + malacia dead calm, from Greek malakia softness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for bonanza
n.

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-).

Online Etymology Dictionary, © 2010 Douglas Harper
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