Is it ensure, insure, or assure?
disintegration dis·in·te·gra·tion (dĭs-ĭn'tĭ-grā'shən)
The breaking up of the component parts of a substance, as in catabolism or decay.
The disorganization or disruption of mental processes in mental illness.
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.