A region made up of several large cities and their surrounding areas in sufficient proximity to be considered a single urban complex.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "megalopolis" in a sentence
"So the uber-immigrant wants to make sure his megalopolis is a desirable destination point for the digital natives?"
"Do you remember years ago there was a thing called megalopolis?"
"I was flipping through Wikipedia and came across the article on megacities (which they use as synonymous with "megalopolis", not "amalgamated city" like Torontonians do) and was struck by one statistic:"