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As with nearly all words in the English language, vertical is derived of a Latin word, verticalis - meaning overhead and vertex - meaning highest point. So you can see by those two definitions why the word vertical came about.
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Mount Thor on Baffin Island in Nunavut, Canada, is the highest vertical drop in the world. It is 1250 meters, or 4101 feet high.
There is no such thing as exactly vertical because either it is vertical or it is not. You cannot have approximately vertical - it is not vertical, then. Vertical means at 90 degrees to the horizon (or horizontal).
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