Definition of Filibuster
To take part in a private military action in a foreign country. | (US, politics) To use obstructionist tactics in a legislative body. | A mercenary soldier; a freebooter; specifically, a mercenary who travelled illegally in an organized group from the United States to a country in Central America or the Spanish West Indies in the mid-19th century seeking economic and political benefits through armed force. | (US politics) A tactic (such as giving long, often irrelevant speeches) employed to delay the proceedings of, or the making of a decision by, a legislative body, particularly the United States Senate. | (US politics) A member of a legislative body causing such an obstruction; a filibusterer.