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Archaean (adj.)

"of the earliest geological age," 1872, coined by U.S. geologist James Dwight Dana from Latinized form of Greek arkhaios "ancient," from arkhē "beginning," verbal noun of arkhein "to be the first," hence "to begin" and "to rule" (see archon).

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Definitions of Archaean from WordNet

archaean (adj.)
of or relating to the earliest known rocks formed during the Precambrian Eon;
Synonyms: archean
From wordnet.princeton.edu