impermanence
im·per·ma·nence
noun
1.
the property of not existing for indefinitely long durations
Origin
From Middle French impermanence, equivalent to im- + permanence.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.