| NOUN | cognition | ABO blood group system, ABO system, ABO group | a classification system for the antigens of human blood |
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| Meaning | A classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O. | |
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| Synonyms | ABO system, ABO group | |
| Broader | classification system | A system for classifying things |
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