The Collaborative International Dictionary
Populous \Pop"u*lous\, a. [L. populosus, fr. populus people: cf. F. populeux.]
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Abounding in people; full of inhabitants; containing many inhabitants in proportion to the extent of the country.
Heaven, yet populous, retains Number sufficient to possess her realms.
--Milton. Popular; famous. [Obs.]
--J. Webster.Common; vulgar. [Obs.]
--Arden of Feversham.Numerous; in large number. [Obs.] ``The dust . . . raised by your populous troops.''
--Shak. [1913 Webster] -- Pop"u*lous*ly, adv. -- Pop"u*lous*ness, n.
Wiktionary
n. The quality of being populous
Usage examples of "populousness".
The Bible agrees with Plato in the statement that these Antediluvians had reached great populousness and wickedness, and that it was on account of their wickedness God resolved to destroy them.
The solitudes of Asia and Africa were once covered with flourishing cities, whose populousness, and even whose existence, was derived from such artificial supplies of a perennial stream of fresh water.