\ˈa͡ɪ͡ənba͡ʊnd], \ˈa‍ɪ‍ənba‍ʊnd], \ˈaɪə_n_b_aʊ_n_d]\
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2010 - New Age Dictionary Database
By Oddity Software
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald

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Archaeozoic Era

  • the time prior to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
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