
A region of indeterminate limits in the upper atmosphere, considered to be the boundary or transition layer between the denser portion of the atmosphere and space.
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http://www.daviddarling.info/encyclopedia/A/aeropause.html

An upper region of the atmosphere, between the stratosphere and outer space, in which gas particles are so sparse as to provide almost no support for man's physiologic requirements or for vehicles that require air for burning fuel. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

Type: Term Pronunciation: ār′ō-pawz Definitions: 1. An upper region of the atmosphere, between the stratosphere and outer space, in which gas particles are so sparse as to provide almost no support for human physiologic requirements or for vehicles that require air to burn fuel.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=1496

aeropause 1. An upper region of the atmosphere, between the stratosphere and outer space, in which gas particles are so sparse as to provide almost no support for man's physiologic requirements or for vehicles that require air for burning fuel or where the air is so thin that aircraft can not operate properly. 2. A region at the upper level of the...
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http://www.wordinfo.info/words/index/info/view_unit/2778/7

the indefinite boundary in the upper atmosphere beyond which the air is too thin for conventional aircraft to operate.
Found on
https://www.infoplease.com/dictionary/aeropause
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