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Proneness (n.) The quality or state of being prone, or of bending downward; as, the proneness of beasts is opposed to the erectness of man.
Proneness (n.) The state of lying with the face down; -- opposed to supineness.
Proneness (n.) Descent; declivity; as, the proneness of a hill.
Proneness (n.) Inclination of mind, heart, or temper; propension; disposition; as, proneness to self-gratification.