4. (noun)decay an inferiorstate 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"
6. (verb)disintegrate, decay, decompose lose a stored charge, magnetic flux, or current "the particles disintegrated during the nuclear fission process"
7. (verb)decay, crumble, dilapidate fall into decay or ruin "The unoccupied house started to decay"
8. (verb)decay undergo decay or decomposition "The body started to decay and needed to be cremated"
Definition of 'decay' 
