from The American Heritage® Dictionary of the English Language, 4th Edition
- Chief; highest; most important: archenemy.
- Extreme or most characteristic of its kind: archconservative.
- Variant of archi-.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- chief, highest, most extreme
from the GNU version of the Collaborative International Dictionary of English
- A prefix signifying chief, as in archbuilder, archfiend.
Middle English arche-, from Old English ærce- and from Old French arche-, both from Latin archi-, from Greek arkhi-, archi-.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin archi-, from Ancient Greek ἀρχι- (archi-), from ἄρχω (archō, "to begin, to lead, to rule, to govern"). (Wiktionary)