statutory instrument
US /ˈstætʃ.ə.tɔːr.i ˈɪn.strə.mənt/
UK /ˈstætʃ.ə.tɔːr.i ˈɪn.strə.mənt/

1.
strumento statutario, atto normativo delegato
a form of delegated legislation in the United Kingdom, by which powers to make detailed regulations under an Act of Parliament are exercised by the executive
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The government issued a new statutory instrument to amend the existing environmental regulations.
Il governo ha emesso un nuovo strumento statutario per modificare le normative ambientali esistenti.
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Many detailed laws are made through statutory instruments rather than full Acts of Parliament.
Molte leggi dettagliate sono create tramite strumenti statutari piuttosto che tramite leggi complete del Parlamento.