- -cracy comb. element forming nouns meaning "rule or government by," from Fr. -cratie or M.L. -cratia, from Gk. -kratia "power, might; rule, sway; power over; a power, authority," from kratos "strength," from PIE *kratus "power, strength" (see HARD (Cf. hard)). The connective -o- has come to be viewed as part of it. Productive in English from c.1800.
Etymology dictionary. 2014.