decay

noun

1.
the process of gradually becoming inferior
2.
a gradual decrease; as of stored charge or current
decline
Derived from:
decay
3.
the organic phenomenon of rotting
addleness rottedness decomposition
Derived from:
decay
4.
an inferior state resulting from the process of decaying
Derived from:
decay
5.
the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
disintegration radioactive decay
Derived from:
decay