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1. The quality or state of being prone, or of bending downward; as, the proneness of beasts is opposed to the erectness of man.

2. The state of lying with the face down; opposed to supineness.

3. Descent; declivity; as, the proneness of a hill.

4. Inclination of mind, heart, or temper; propension; disposition; as, proneness to self-gratification.