Degeneration

n.	1.	The act or state of growing worse, or the state of having become worse; decline; degradation; debasement; degeneracy; deterioration. Our degeneration and apostasy. - Bates.
	2.	(Physiol.) That condition of a tissue or an organ in which its vitality has become either diminished or perverted; a substitution of a lower for a higher form of structure; as, fatty degeneration of the liver.
	3.	(Biol.) A gradual deterioration, from natural causes, of any class of animals or plants or any particular organ or organs; hereditary degradation of type.
	4.	The thing degenerated. Cockle, aracus, . . . and other degenerations. - Sir T. Browne. Amyloid degeneration See under Amyloid, Caseous, etc.

Noun	1.	degeneration - the process of declining from a higher to a lower level of effective power or vitality or essential quality Synonyms: devolution
	2.	degeneration - the state of being degenerate in mental or moral qualities Synonyms: decadence, decadency, degeneracy
	3.	degeneration - passing from a more complex to a simpler biological form Synonyms: retrogression

abandon, abandonment, abjection, about-face, accommodation, adaptation, adjustment, alteration, amelioration, apostasy, atrophy, betterment, break, change, change of heart, changeableness, closed loop, closed sequence, comedown, constructive change, continuity, conversion, corruptedness, corruption, corruptness, current-control circuit, debasement, decadence, decadency, declension, declination, decline, defection, deformation, degeneracy, degenerateness, degenerative change, degradation, demoralization, demotion, depravation, depravedness, depravity, depreciation, derogation, descent, deterioration, deviation, devolution, difference, discontinuity, dissoluteness, divergence, diversification, diversion, diversity, downfall, downgrade, downtrend, downturn, downward mobility, downward trend, drop, dying, ebb, effeteness, fading, failing, failure, failure of nerve, fall, falling-off, feedback, fitting, flip-flop, flip-flop circuit, gradual change, improvement, involution, lapse, loss of tone, melioration, mitigation, modification, modulation, moral pollution, moral turpitude, overthrow, perversion, positive feedback, process loop, profligacy, qualification, quality loop, radical change, re-creation, realignment, redesign, reform, reformation, regression, remaking, renewal, reprobacy, reshaping, restructuring, retrocession, retrogradation, retrogression, reversal, reversed feedback, revival, revivification, revolution, rottenness, shift, slippage, slump, sudden change, switch, total change, transition, turn, turnabout, turpitude, upheaval, variation, variety, violent change, wane, worsening