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.

Source: Webster's Revised Unabridged Dictionary (1913)