altitude noun

ADJ. great, high | low | cruising The plane took off and climbed to cruising altitude.

VERB + ALTITUDE cruise at, fly at, maintain The aircraft maintained an altitude of 28,000 feet. | reach, rise to The aviators reported the columns of smoke rising to an altitude of 2,000 feet. | gain | lose The plane suddenly started to lose altitude.

ALTITUDE + NOUN sickness

PREP. at an/the ~ No trees will grow at that altitude.