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forbidden

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adjective for·bid·den \-ˈbi-dən\

Simple Definition of forbidden

  • : not permitted or allowed

Source: Merriam-Webster's Learner's Dictionary

Full Definition of forbidden

  1. 1 :  not permitted or allowed

  2. 2 :  not conforming to the usual selection principles —used of quantum phenomena <forbidden transition> <forbidden radiation> <forbidden spectral line>



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