meg·a·lo·pol·i·tan I. \|megəlō|pälətən also -ətən or -əd.ən\adjective Etymology: from megalopolis, after such pairs as English metropolis: metropolitan : of, relating to, or characterized by a megalopolis < becoming a megalopolitan people — B.I.Bell > < this immense megalopolitan civilization — Kenneth Rexroth > II. noun (-s) : one who lives in a megalopolis