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HMSO

noun
 
 
/ˌeɪtʃ.em.esˈəʊ/ US  /-ˈoʊ/

Definition

abbreviation for Her or His Majesty's Stationery Office: a British government department that prints many official documentsGovernment departments and organizations
(Definition of HMSO noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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