Definition of: disintegration

(dis·in′tə·grā′shən) noun
1. The act of disintegrating, or the state of being disintegrated; a crumbling away.
2. Geol. The gradual decay and wasting, as of rocks under elemental action.
3. Physics The disappearance of an initial quantity of any radioactive element due to its conversion into another element as a result of the changes in nuclear properties attendant on the emission of alpha or beta particles.