As adjectives the difference between impermanent and provisional
is that impermanent is not permanent; momentary while provisional is temporary.
As a noun provisional is
a postage stamp issued locally before an official issue is released.
impermanent
English
Adjective
(head)
Not permanent; momentary.
Related terms
* impermanence
References
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provisional
English
Adjective
(head)
temporary
Noun
(philately) a postage stamp issued locally before an official issue is released.