Definition from Wiktionary, the free dictionary
- The quality or state of being prone, or of bending downward.
- The proneness of animals is opposed to the erect posture of human beings.
- The state of lying with the face down.
- (dated) Descent; declivity.
- the proneness of a hill
- Inclination of mind, heart, or temper; propension; disposition.
- proneness to self-gratification
- (state of lying face-down) supineness