noun
absolute ceiling
Aviation term: the maximum altitude at which an aircraft can maintain level flight under standard conditions.
この機体の絶対上昇限度は約1万メートルです。
The absolute ceiling of this aircraft is about 10,000 meters.
Service ceiling: the altitude at which the aircraft can still climb at a specified rate (e.g., 100 ft/min), lower than the absolute ceiling.
Compound of 絶対 (absolute) + 上昇 (climb, ascent) + 限度 (limit). A direct translation of the English aviation term 'absolute ceiling'.