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From: WordNet (r) 2.0

 Archean eon
      n : the time from 3,800 million years to 2,500 million years
          ago; earth's crust formed; unicellular organisms are
          earliest forms of life [syn: Archean, Archean aeon, Archeozoic,
           Archaeozoic, Archeozoic eon, Archaeozoic aeon]