Plural of bonanza; sudden strokes of good luck, windfalls, or large and valuable discoveries or profits, especially in mining or commerce.
From Spanish 'bonanza' (fair weather, prosperity), possibly derived from Latin 'bonus' (good) combined with elements related to weather or fortune. The word entered English during the California Gold Rush.
Bonanza entered English right when prospectors were striking it rich, so the word itself is tangled up with Gold Rush fever and get-rich-quick dreams—it literally means the good weather after a storm when ships could sail!
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