adj 1  :  capable of existing together in a satisfactory relationship (as marriage)  2  :  capable of being used in transfusion or grafting without immunological reaction (as agglutination or tissue rejection) <treatment of hemophilia by transfusion of blood>   3  of medications  :  capable of being administered jointly without interacting to produce deleterious effects or impairing their respective actions com*pat*i*bil*i*ty n pl  -ties  
 
 
 
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