stratosphere
noun
strato·sphere
ˈstra-tə-ˌsfir
1
: the part of the earth's atmosphere which extends from the top of the troposphere to about 30 miles (50 kilometers) above the surface and in which temperature increases gradually to about 32°F (0°C) and clouds rarely form
2
: a very high or the highest region on or as if on a graded scale
construction costs in the stratosphere
the celebrity stratosphere
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Merriam-Webster unabridged
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