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acclivity (noun) the steep slope upwards a hill.
If the hill side slopes upward steeply, the slope is its acclivity. The ease or difficulty in climbing up a hill depends on its acclivity. A high acclivity makes it difficult for us to move up, and if the acclivity is low, it is easy to climb up.
- The drive up the hill was a strain on the engine as the acclivity was rather high.
- The climbers found their initial enthusiasm wearing away, as the acclivity was much higher than they had expected.