Lewis Short
Mĕgălŏpŏlis | Mĕgălē pŏ-lis, ārum | Mĕgălēn pŏlin, a, um | Mĕgălŏpŏlītae, ōrum | Mĕgălŏpŏlītānus | Mĕ-gălŏpŏlītāni (noun F.f.m.m) : f., or (acc. ), f., = Μεγαλόπολις or Μεγάλη πόλις
* A city of Arcadia, the birthplace of Polybius.—Form Megalopolis, Liv. 36, 31, 6; 45, 28, 4.—Form Megale polis, Plin. 4, 6, 10, § 20; Liv. 32, 5, 5; 35, 36, 10.—Hence
* M., the inhabitants of Megalopolis, Liv. 28, 8.
* Adj., of or belonging to Megalopolis, Megalopolitan, Liv. 36, 13.—Subst.: , , m., the inhabitants of Megalopolis, Liv. 32, 22.
Charlton T. Lewis, Charles Short, A Latin Dictionary