con·gress 
/ˈkɑ:ŋgrəs, Brit ˈkɑ:ŋˌgrɛs/ noun
plural con·gress·es /ˈkɑ:ŋgrəs, Brit ˈkɑ:ŋˌgrɛs/ noun 1 [count] : a formal meeting in which representatives or experts discuss important matters, make decisions, etc.
▪ a Communist Party congress ▪ an annual academic congress 2 a : the group of people who are responsible for making the laws of a country in some kinds of government [count] ▪ She was recently elected to the country's congress. ▪ the congresses of Mexico and Chile [noncount] ▪ acts of congress
b Congress [singular] : a particular congress ; especially : the congress of the United States that includes the Senate and the House of Representatives
▪ The bill easily passed both houses of Congress. ▪ Congress is not currently in session. 3 [singular] — used in the names of some political parties ▪ the Indian National Congress
▪ a Communist Party congress ▪ an annual academic congress
b Congress [singular] : a particular congress ; especially : the congress of the United States that includes the Senate and the House of Representatives
▪ The bill easily passed both houses of Congress. ▪ Congress is not currently in session.
— con·gres·sion·al /kənˈgrɛʃənl̟/ adjective
▪ a congressional committee ▪ congressional investigators
▪ a congressional committee ▪ congressional investigators
