decay.

Rot; any processes or result of organic matter being gradually decomposed, especially by microbial action.

tooth decay/dental decay—wood-decay fungi—bacterial decay—photochemical decay

Deterioration of condition; loss of status, quality, strength, or fortune.

civic and moral decay—systemic decay—fall into decay—urban decay—arrested decay—memory decay

Radioactive decay; decomposition of an atom or its nucleus.

alpha decay—gamma decay—fission decay—decay chain

Particle decay; decomposition of a sub-atomic particle.

Continuous decrease of a quantity.

exponential decay—decay rate—orbital decay—decay time—decay constant—time decay

Overthrow, destruction, ruin, death.

Array decay.

To deteriorate, to get worse, to lose strength or health, to decline in quality.

The pair loved to take pictures in the decaying hospital on forty-third street.

To deteriorate, to get worse, to lose strength or health, to decline in quality. To undergo bit rot, that is, gradual degradation.

To deteriorate, to get worse, to lose strength or health, to decline in quality. To undergo software rot, that is, to fail to be updated in a changing environment, so as to eventually become legacy or obsolete.

To deteriorate, to get worse, to lose strength or health, to decline in quality. To undergo prolonged reduction in altitude (above the orbited body).

To rot, to go bad.

The cat's body decayed rapidly.

To change by undergoing fission, by emitting radiation, or by capturing or losing one or more electrons; to undergo radioactive decay.

To undergo optical decay, that is, to relax to a less excited state, usually by emitting a photon or phonon.

Loss of airspeed due to drag.

To cause to rot or deteriorate.

The extreme humidity decayed the wooden sculptures in the museum's collection in a matter of years.

Of an array: to lose its type and dimensions and be reduced to a pointer, for example when passed to a function.