| Noun | 1. | ACLANT - a major strategic headquarters of NATO located in the United States; is under the authority of the North Atlantic Council NATO, North Atlantic Treaty Organization - an international organization created in 1949 by the North Atlantic Treaty for purposes of collective security SACLANT, Supreme Allied Commander Atlantic - commanding officer of ACLANT; a general of the United States Army nominated by the President of the United States and approved by the North Atlantic Council headquarters - (plural) a military unit consisting of a commander and the headquarters staff |