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black swan - definition and synonyms

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noun [countable]     black swan pronunciation in American English
/ˌblæk ˈswɑn/
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Word story
When Dutch explorer Willem de Vlamingh first saw black swans in Western Australia in the 17th century, Europeans believed that all swans were white, so a black swan seemed an impossibility. The term came to be used for an event that happens even though it seems impossible.

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