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megacity

[meg-uh-sit-ee] /ˈmɛg əˌsɪt i/
noun, plural megacities.
1.
a city having a population of one million or more.
Origin
1965-1970
1965-70; mega- + city
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for megacities

megacity

/ˈmɛɡəˌsɪtɪ/
noun (pl) -cities
1.
a city with over 10 million inhabitants
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 megacities

megacity

n.

also mega-city, 1968, from mega- + city.

Online Etymology Dictionary, © 2010 Douglas Harper
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