| ABO | a dark-skinned member of a race of people living in Australia when Europeans arrived |
|---|---|
| ABO | blood type antibodies |
| ABO | a classification system for the antigens of human blood |
| ABO | a classification system for the antigens of human blood |
| ABO | a classification system for the antigens of human blood |
| ABO | (baseball) on first or second or third base |
| ABO | on a ship, train, plane or other vehicle |
| ABO | part of a group |
| ABO | side by side |
| ABO | the condition in which the upper teeth do not touch the lower teeth when biting |
| ABO | housing that someone is living in |
| ABO | the address where a person lives |