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megacity

[meg-uh-sit-ee]
noun, plural meg·a·cit·ies.
  1. a city having a population of one million or more.
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Origin of megacity

First recorded in 1965–70; mega- + city
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for megacity

megacity

noun plural -cities
  1. a city with over 10 million inhabitants
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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

Word Origin and History for megacity

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper