Definitions for ecosphereˈɛk oʊˌsfɪər, ˈi koʊ-
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Random House Webster's College Dictionary
ec•o•sphereˈɛk oʊˌsfɪər, ˈi koʊ-(n.)
the part of the atmosphere, from sea level to about 13,000 ft. (4000 m) above, in which it is possible to breathe normally without aid.
Category: Meteorology
Category: Ecology
Ref: biosphere .
Origin of ecosphere:
1950–55
Wiktionary
ecosphere(Noun)
The portion of the atmosphere from sea-level to about 4000 meters in which it is possible to breathe without technological assistance.
ecosphere(Noun)
the biosphere
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"ecosphere." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/ecosphere>.