al·ti·tude 
/ˈæltəˌtu:d, Brit ˈæltəˌtju:d/ noun
plural al·ti·tudes /ˈæltəˌtu:d, Brit ˈæltəˌtju:d/ noun : the height of something (such as an airplane) above the level of the sea [count] ▪ We're now flying at an altitude [=height] of 10,000 feet. ▪ the air temperature at different altitudes ▪ Some visitors find it difficult to adjust to the city's high altitude. ▪ plants found at higher/lower altitudes [=elevations] [noncount] ▪ The plane lost/gained altitude rapidly. ▪ flying at low/high altitude ▪ She trained for the race at altitude. [=at a high altitude, where the air is thin]
