| AAR | a river in north central Switzerland that runs northeast into the Rhine |
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| AAR | nocturnal burrowing mammal of the grasslands of Africa that feeds on termites |
| AAR | striped hyena of southeast Africa that feeds chiefly on insects |
| AAR | a river in north central Switzerland that runs northeast into the Rhine |
| AAR | a river in north central Switzerland that runs northeast into the Rhine |
| AAR | port city of Denmark in eastern Jutland |
| AAR | (Old Testament) elder brother of Moses and first high priest of the Israelites |
| AAR | American professional baseball player who hit more home runs than Babe Ruth (born in 1934) |
| AAR | United States politician who served as Vice President under Jefferson |
| AAR | United States composer who developed a distinctly American music (1900-1990) |
| AAR | tall-stalked very woolly mullein with densely packed yellow flowers |
| AAR | an association of people to promote the welfare of senior citizens |