definition of congressional
conÂ·gresÂ·sionÂ·al. adj. 1. Of or relating to a congress: a congressional convention. 2. Relating to or working in the office of a member or members of a congress: a congressional aide. n. A member of a congress.onÂ·gresÂ·sionÂ·al. adj. 1. Of or relating to a congress: a congressional convention. 2. Relating to or working in the office of a member or members of a congress: a congressional aide. n. A member of a congress.