| n. | 1. | The quality or state of being prone, or of bending downward; |
| 2. | The state of lying with the face down; - opposed to | |
| 3. | Descent; declivity; | |
| 4. | Inclination of mind, heart, or temper; propension; disposition; |
| Noun | 1. | proneness - being disposed to do something; "accident proneness" |