Impermanence

n. transience, lack of permanence, quality of being temporary

Impermanence (Sanskrit: अनित्य anitya; Pāli: अिनच्च anicca; Tibetan: mi rtag pa; Chinese: wúcháng; Japanese: 無常 mujō) is one of the essential doctrines or Three marks of existence in Buddhism. The term expresses the Buddhist notion that every conditioned existence, without exception, is inconstant and in flux, even gods.
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Noun
1. the property of not existing for indefinitely long durations
(synonym) impermanency
(antonym) permanence, permanency
(hypernym) duration, length
(hyponym) temporariness

(n.)
Alt. of Impermanency
  

(Sanskrit: anitya, Pali: anicca) This term refers to the Buddhist notion that all things of samsara are impermanent. Once created, they decay and pass away. Although this is particularly true for human illness and death, the idea refers to the nature of all things. It is one of the reasons for suffering and is considered one of the three marks of existence.