arithˈmocracynonce-wd. [f.Gr. ἀριθµό-ς number + -κρατία rule: see -cracy.] A form of government in which the power is vested in the simply numerical majority. 1850Kingsley Alt. LockePref. (1879) 116 A ‘democracy’ of mere numbers is no democracy, but a mere brute ‘arithmocracy.’