Definition of fifty-year rule in English:

fifty-year rule

Line breaks: fifty-year rule

Entry from British & World English dictionary

noun

British historical
A rule that public records may be open to inspection after a lapse of fifty years. Superseded in the UK in 1968 by the thirty-year rule.

Definition of fifty-year rule in:

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Word of the day animalcule
Pronunciation: ˌanəˈmalˌkyo͞ol
noun
a microscopic animal