Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun archean

1 sense of archean

Sense 1
Archean, Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon -- (the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life)
       INSTANCE OF=> eon, aeon -- (the longest division of geological time)

Antonyms of adj archean

1 sense of archean

Sense 1
archean, archaean -- (of or relating to the earliest known rocks formed during the Precambrian Eon)

INDIRECT (VIA late, early) -> middle -- (between an earlier and a later period of time; "in the middle years"; "in his middle thirties")
INDIRECT (VIA early, middle) -> late -- (being or occurring at an advanced period of time or after a usual or expected time; "late evening"; "late 18th century"; "a late movie"; "took a late flight"; "had a late breakfast")

Similarity of adj archean

1 sense of archean

Sense 1
archean, archaean -- (of or relating to the earliest known rocks formed during the Precambrian Eon)
       => early (vs. middle) (vs. late) -- (at or near the beginning of a period of time or course of events or before the usual or expected time; "early morning"; "an early warning"; "early diagnosis"; "an early death"; "took early retirement"; "an early spring"; "early varieties of peas and tomatoes mature before most standard varieties")