disintegration

noun5

1. •
   A process by which anything disintegrates.
2. •
   The condition of anything which has disintegrated.
3. •
   The wearing away or falling to pieces of rocks or strata, produced by atmospheric action, frost, ice, etc.
4. •
   The process of radioactive decay.
5. •
   The radioactive decay of a single atom.

   • The sample exhibited an activity of three disintegrations per second.