No, it is a verb or noun. The noun "permit" (authorization) may be used as a noun adjunct with other nouns (permit parking, permit application).
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No. Use permitted as for example, That is not permitted. It is forbidden.
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it might be permit since it means to allow
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The verb related to the noun permission is to permit (to allow), i.e. to permit someone to do something is to give permission. The word permit is also used as a noun meaning a written permission or other authorization.
Adjective