1. (noun) United States explorer who (with Meriwether Lewis) led an expedition from St. Louis to the mouth of the Columbia River; Clark was responsible for making maps of the area (1770-1838)

• william clark

2. (noun) United States general who was Allied commander in Africa and Italy in World War II and was commander of the United Nations forces in Korea (1896-1984)

• mark clark
• mark wayne clark

3. (noun) United States psychologist (born in Panama) whose research persuaded the Supreme Court that segregated schools were discriminatory (1914-2005)

• kenneth bancroft clark
• kenneth clark

4. (noun) Canadian politician who served as prime minister (1939-)

• charles joseph clark
• joe clark