evolution,
development (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms
physical process,
process a sustained phenomenon or one marked by gradual changes through a series of states; "events now in process"; "the process of calcification begins later for boys than for girls"
attack a decisive manner of beginning a musical tone or phrase
obsolescence the process of becoming obsolete; falling into disuse or becoming out of date; "a policy of planned obsolescence"
degeneration -
passing from a more complex to a simpler biological form
Degeneration -
Gradual deterioration, from natural causes, of any class of animals or plants or any particular organ or organs; hereditary degradation of type.
Degeneration -
A thing that has degenerated.
OmegaWiki Dictionary
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Degeneration A gradual deterioration from natural causes.