Link to this page adjective: Of or pertaining to the Archaeozoic. Like or from the earliest forms of animal life. formed in or of the previous of two divisions of this Precambrian age. of or belonging to earlier in the day of two divisions of Precambrian age View More proper-noun: Period of time determined to occur just before 2.5 thousand million years back. noun: the time from 1.5 billion to 5 billion years back; the full time if the planet's crust formed; an occasion whenever only unicellular organisms as well as the first forms of life are present. The Archæozoic eon. enough time from 3,800 million many years to 2,500 million years ago; earth's crust created; unicellular organisms tend to be first kinds of life View More others: In geology, having mention of the earliest life-forms based in the rocks: a phrase introduced by Le Conte and employed by Dana to designate a hypothetical division or eon of Archæan time contradistinguished from the Azoic eon. Related Sources Definition for "Archaeozoic" Synonym for "Archaeozoic" Hypernym for "Archaeozoic" Equivalent for "Archaeozoic"