Wiktionary
n. 1 An extremely large city, metropolis or urban area. 2 The merged urban area of several close cities.
Usage examples of "supercity".
The supercity was not an option for me anymore, but I daydreamed for a while as I wandered the wide leafy streets and used the glow-walks like everyone else.
In home remote year the historians will record that Twentieth Century America attempted the astonishing blunder of changing its culture to fit automobiles instead of people, putting a skin of concrete and asphalt over millions of acres of arable land, rotting the hearts of their cities, so encouraging the proliferation of murderous, high-speed junk that when finally the invention of the Transporlon rendered the auto obsolete, it took twenty years and half a trillion dollars to obliterate the ugliness of all the years of madness, and rebuild the supercities in a manner to dignify the human instead of his toys.
Cats were the most popular, since they adapted easily to the mile-high million-windowed hovels that formed the supercities, but a few breeds of dogs—Keeshonds, Shih Tzus, Lhasa Apsos, and a handful of others still existed in some quantity.
From New York, brainpox would rocket to London and Tokyo, and it would fly to Lagos, Nigeria, and it would land in Shanghai and Sipgapore, and it would amplify through Calcutta, and it would get to Sao Paulo and Mexico City and Dacca in Bangladesh and Djakarta in Indonesia and all the great supercities of the earth.
A lot of them were arising naturally-more than ten billion people crammed into polluted supercities constitute a wonderland of opportunity for virus evolution-and a lot more were being tailored in labs for use as transgenic vectors, pest controllers, so-called beneficial fevers, and so on.