Etymology
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megalopolis (n.)

"a metropolis; a very large, heavily populated urban complex," 1832, from Greek megas (genitive megalou) "great" (see mickle) + polis "city" (see polis). The word was used in classical times as an epithet of great cities (Athens, Syracuse, Alexandria), and it also was the name of a former city in Arcadia. Related: Megalopolitan.

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Definitions of megalopolis

megalopolis (n.)
a very large urban complex (usually involving several cities and towns);
From wordnet.princeton.edu