Opposed to parliament or parliamentary procedures; contrary to the principles and practices of parliamentary government.
From antiparliament + -ary (suffix forming adjectives, like in parliamentary). This term specifically modifies nouns to describe antiparliamentary actions, policies, or ideologies.
Lawyers and constitutional experts use 'antiparliamentary' to describe unconstitutional actions by executives—like when a president or king ignores an elected legislature, that's considered fundamentally antiparliamentary.
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