Congressional means to do with a national law-making assembly. A congressional hearing, congressional approval, congressional elections.
In practice it means the American Congress in almost every use, and a congressional hearing is the standard instrument for questioning officials in public. The word appears in Indian and other political systems too, where it means something different.
1adjectivecongressionalTo do with a national law-making assembly.
“The company's boss was called to answer questions at a congressional hearing.”
congressional is a quality.
From congression + -al.
Etymology from Wiktionary, CC BY-SA