He was losing altitude just when she had expected him to climb.
She knew she had chosen the most dangerous route, over too long a stretch of the worst mountain barrier-but it was the shortest line, and safety lay in altitude, and no mountains seemed dangerous compared to the dispatcher of Bradshaw.
"Miss Taggart" she said, "I am not your equal in philosophical altitude.
There are no more uses of "altitude" in the book.
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The altitude gave her a headache.
Denver is called the Mile High City because of its altitude (1 mile above sea level).