Decadence az 2019 set times. 1. decadence synonyms, decadence pronunciation, decadence translation, English dictionary definition of decadence. 2. decadence presupposes a reaching and passing the peak of development and implies a turn downward with a consequent loss in vitality or energy. The adjective form of decadence is decadent, which is used to describe things in such a state, especially societies or behavior. Jan 20, 2026 · Noun decadence (countable and uncountable, plural decadences) A state of moral or artistic decline or deterioration; decay What does decadence mean? Decadence is a state of deterioration or decay, especially due to being excessively morally corrupt or self-indulgent. meanings, etymology, pronunciation and more in the Oxford English Dictionary Decadence definition: A process, condition, or period of deterioration or decline, as in morals or art; decay. A process, condition, or period of deterioration or decline, as in morals or art; decay. Define decadence. n.