Humean /ˈhjuːmɪən/adjective 1noun 1forms 1 adjective1 •Of or pertaining to the philosophy of David Hume (1711–1776).§ Treatise of Human Nature, L. 467. In the P. S. to this letter, a view will be given of the Humian system, taken exactly as it appeared to its author at six o’clock in the evening. — 1777 noun1 •An adherent or advocate of Humean doctrines.Humians see no necessary uniformity in phenomena because they expect some logical law to which uniformity may be referred. — 1879 formsHumeans