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mesopause
1. The upper limit and the coldest portion of the mesosphere which is considered to be the transition zone between the mesosphere and the thermosphere.

The mesosphere is the region immediately above the stratosphere and just below the thermosphere.

2. A transition layer of the atmosphere (at an altitude of about 80 km) between the mesosphere, where the temperature decreases with altitude, and the thermosphere, where the temperature increases with altitude; so the mesopause is a level of minimum temperature.
This entry is located in the following unit: meso-, mes-, mesi- (page 6)