Gradual decomposition of organic matter; rot.

• Damage such as tooth decay caused by rot.

Deterioration in condition, quality, or morals.

• Loss of power, prosperity, or status.

To rot or decompose.

• To go bad, especially food or wood.

To deteriorate in quality, health, or strength.

• To decline morally, socially, or culturally.

The spontaneous disintegration of an unstable nucleus with radiation.

• Change of a particle by emitting or capturing subatomic particles.

A gradual decrease of signal, charge, current, or intensity.

• Reduction over time of amplitude, flux, or brightness.