The archi-prefix, also arch - Maple - arci-, arz - derived from the Greek verb archo, guide, send, be the first, dominate, take, go ahead and means pre-eminence, superiority, domain. Archi-in front of an adjective meaning very. Popular means so well known. But not all adjectives admit these prefixes that can also function as suffixes in monarchy, anarchy, autarky.
