As nouns the difference between idiocracy and mediocracy
is that idiocracy is government that is based upon abstract theory while mediocracy is a social hierarchy in which the mediocre prevails.
idiocracy
English
Etymology 1
Noun
(idiocracies)
government that is based upon abstract theory
Etymology 2
Noun
(idiocracies)
(humorous) A government ruled by idiots.
mediocracy
English
See also
* dumb down
* idiocracy