noun, noun or participle which takes 'suru', transitive verb
Refers to a secret plan or scheme, often with negative connotations. Can also mean a formal discussion or conference, though this usage is less common.
彼らは政府転覆の謀議を巡らせていた。
They were plotting to overthrow the government.
謀議を重ねた末、彼らは計画を実行に移した。
After repeated conferences, they put the plan into action.