decay in WordNet English dictionary

1. fall into decay or ruin
   "The unoccupied house started to decay"
   decay  crumble  dilapidate 
   
2. lose a stored charge, magnetic flux, or current
   "the particles disintegrated during the nuclear fission process"
   disintegrate  decay  decompose 
   
3. undergo decay or decomposition
   "The body started to decay and needed to be cremated"
   decay 
   

1. the organic phenomenon of rotting
   decay  decomposition 
   
2. a gradual decrease; as of stored charge or current
   decay  decline 
   
3. the process of gradually becoming inferior
   decay 
   
4. the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
   decay  radioactive decay  disintegration 
   
5. an inferior state resulting from the process of decaying
   "the corpse was in an advanced state of decay"; "the house had fallen into a serious state of decay and disrepair"
   decay