What is a denivelation? Here are some definitions.
Noun
(caving) the difference in level (depth) between two parts of a cavesystem, usually the highest and lowest known point. depth is the distance between the cave entrance and the lowest known point reached. denivelation is less than or equal to depth;
(hiking, cycling, trail running) the difference in level between the highest and lowest part of the track, regardless of starting or ending point