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biosphere (n.)

"Earth's surface and lower atmosphere as the realm of living organisms," 1899, from or modeled on German Biosphäre (1875), which was coined by German geologist Eduard Suess; see bio- + sphere.

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Definitions of biosphere from WordNet

biosphere (n.)
the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist;
From wordnet.princeton.edu