1. (noun) decay
the process of gradually becoming inferior
Synonyms: disintegration, decomposition, radioactive decay, decline
2. (noun) decay, decline
a gradual decrease; as of stored charge or current
Synonyms: disintegration, fall, decay, downslope, descent, radioactive decay, decomposition, declension, decline, declivity, declination, diminution
3. (noun) decay, decomposition
the organic phenomenon of rotting
Synonyms: disintegration, chemical decomposition reaction, decomposition, putrefaction, radioactive decay, vector decomposition, decline, rot, rotting, decay, decomposition reaction
4. (noun) decay
an inferior state resulting from the process of decaying
Synonyms: disintegration, decomposition, radioactive decay, decline
5. (verb) decay, radioactive decay, disintegration
the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
Synonyms: disintegration, decomposition, radioactive decay, decline, decay, annihilation, dissolution
6. (verb) disintegrate, decay, decompose
lose a stored charge, magnetic flux, or current
Synonyms: break down, decay, break up, moulder, disintegrate, decompose, molder, dilapidate, crumble, rot
7. (verb) decay, crumble, dilapidate
fall into decay or ruin
Synonyms: break down, dilapidate, decompose, crumple, disintegrate, tumble, collapse, crumble, decay, fall apart
8. (verb) decay
undergo decay or decomposition
Synonyms: crumble, decompose, dilapidate, disintegrate
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Synonyms and Antonyms of decay 
