noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The base altitude of the exosphere, where particles often escape the atmosphere as it blends into space.

Synonyms

All synonyms

critical altitudecritical altitudeexopauseexopausethermopausethermopause

Etymology

From exo- + base.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.