Definitions of declivity

1. a downward slope or bend

2. A descending surface; a sloping place.

3. A gradual descent; deviation or change from a horizontal line; downward slope.

4. Decliviteus.

5. A downward slope, as of a hill or mountain.

6. Inclination downward; land or a surface that slopes downward.

7. Inclination downward; a slope; gradual descent- opposite of acclivity.