1. of or relating to congress; - Example: "congressional hearing"
The Collaborative International Dictionary of English v.0.48:
Congressional \Con*gres"sion*al\, a.
Of or pertaining to a congress, especially, to the Congress
of the United States; as, congressional debates.
Congressional and official labor. --E. Everett.
Congressional District, one of the divisions into which a
State is periodically divided (according to population),
each of which is entitled to elect a Representative to the
Congress of the United States.
WordNet (r) 3.0 (2006):
adj 1: of or relating to congress; "congressional hearing"