Gradual failure of health, strength, soundness, prosperity, or of any species of excellence or perfection; tendency toward dissolution or extinction; corruption; rottenness; decline; deterioration; as, the decay of the body; the decay of virtue; the decay of the Roman empire; a castle in decay. "Perhaps my God, though he be far before, May turn, and take me by the hand, and more May strengthen my decays." "His (Johnson's) failure was not to be ascribed to intellectual decay." "Which has caused the decay of the consonants to follow somewhat different laws."