Meaning of “unwritten” in the English Dictionary

british dictionary

"unwritten" in British English

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(Definition of “unwritten” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"unwritten" in American English

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unwrittenadjective [ not gradable ]

us /ʌnˈrɪt·ən/

not written

An unwritten law/rule is one that does not exist officially, but which people generally accept and obey:

There’s an unwritten rule at work that you don’t wear jeans.

(Definition of “unwritten” from the Cambridge Academic Content Dictionary © Cambridge University Press)