Antonyms of adj archaean

1 sense of archaean

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 archaean

1 sense of archaean

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")

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