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  1. Oxford American Dictionary

    Gaia hypothesis

    • IPA[ˈɡīə hīˈpäTHəsəs]
    • n.
      the theory, put forward by James Lovelock, that living matter on the earth collectively defines and regulates the material conditions necessary for the continuance of life. The planet, or rather the biosphere, is thus likened to a vast self-regulating organism.

    • noun: Gaia hypothesis