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English definition of “regulation”

regulation

noun [C or U] uk   /ˌreɡ.jʊˈleɪ.ʃən/ us  
B2 an official rule or the act of controlling something: safety/health/traffic/fire/security regulations The correct procedure is laid down in the rules and regulations. government regulation of inflationRules and laws

regulation

adjective uk   /ˌreɡ.jʊˈleɪ.ʃən/ us  
according to the rules or the usual way of doing things: businessmen in their regulation pinstripe suits It's regulation to wear suits at the office. a regulation football pitchHabitual and customary
(Definition of regulation from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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