disintegration

noun

1. the act or process of disintegrating.
2. Physics. decay(def 8).

n.

1. The breaking up of the component parts of a substance, as in catabolism or decay.
2. The disorganization or disruption of mental processes in mental illness.
3. The natural or induced transformation of an atomic nucleus from a more massive to a less massive configuration by the emission of particles or radiation.