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Definition of the thirty-year rule noun from the Oxford Advanced Learner's Dictionary

the thirty-year rule

noun
 
/ðə ˌθɜːti ˈjɪə ruːl/,
 
/ðə ˌθɜːti ˈjɜː ruːl/
 
/ðə ˌθɜːrti ˈjɪr ruːl/
[singular]
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  1. a British government rule which prevented certain official documents from being made public until a period of thirty years had passed. It was replaced when the Freedom of Information Act was passed in 2005.
trait
noun
 
 
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