Definition of unwritten adjective from the Oxford Advanced Learner's Dictionary

     

    unwritten

     adjective
    adjective
    BrE BrE//ˌʌnˈrɪtn//
     
    ; NAmE NAmE//ˌʌnˈrɪtn//
     
     
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  1. 1unwritten law, rule, agreement, etc. a law, etc. that everyone knows about and accepts even though it has not been made official an unwritten understanding that nobody leaves before five o’clock
  2. 2(of a book, etc.) not yet written The photographs were to be included in his as yet unwritten autobiography.
See the Oxford Advanced American Dictionary entry: unwritten