/ ˈæltɪtjuːd; NAmE -tuːd/ noun
1.
[ C , usually sing. ] the height above sea level :
We are flying at an altitude of 6 000 metres.
The plane made a dive to a lower altitude.
2.
[ C , usually pl. , U ] a place that is high above sea level :
Snow leopards live at high altitudes .
The athletes trained at altitude in Mexico City.
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WORD ORIGIN
late Middle English : from Latin altitudo , from altus high.