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Not lasting or durable; not permanent.
im·per′ma·nence, im·per′ma·nen·cy n.
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|Noun||1.||impermanency - the property of not existing for indefinitely long durations|
length, duration - continuance in time; "the ceremony was of short duration"; "he complained about the length of time required"
temporariness - the property of lasting only a short time
transience, transiency, transitoriness - an impermanence that suggests the inevitability of ending or dying
mortality - the quality or state of being mortal