Etymology
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impermanent (adj.)

1650s, from assimilated form of in- "not, opposite of" (see in- (1)) + permanent.

updated on July 22, 2012

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Definitions of impermanent from WordNet

impermanent (adj.)
not permanent; not lasting; "politics is an impermanent factor of life"- James Thurber;
impermanent palm cottages
Synonyms: temporary
impermanent (adj.)
existing or enduring for a limited time only;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.