1561, from L.L.
aristocratia, from Gk.
aristokratia "government, rule of the best," from
aristos "best" (originally "most fitting," from PIE
*ar-isto-, superlative form of
*ar- "to fit together") +
kratos "rule, power" (see
-cracy). At first in a literal sense; meaning "rule by a privileged class (best-born or best-favored by fortune)" is from 1577 and became paramount 17c. Hence, the meaning "patrician order" (1651); and
aristocratic "grand, stylish" (1845). In early use contrasted with
monarchy; after Fr. and Amer. revolutions, with
democracy. Aristocrat first recorded 1789, from Fr.
aristocrate.