/ Dictionary / Index A Archean: Meaning and Definition of Find definitions for: Ar•che•an Pronunciation: (är-kē'un), [key] — adj. noting or pertaining to rocks of the Archeozoic portion of the Precambrian Era. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: archean (Thesaurus) arche- archebanc Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language