WordWeb Online

1. Able to exist and perform in harmonious or agreeable combination
   "her deeds were compatible with her ideology"; "a compatible married couple";
   - simpatico [informal]
    
2. Capable of forming a homogeneous mixture that neither separates nor is altered by chemical interaction
    
3. Capable of being used with or connected to other devices or components without modification

See also: congenial, congruous, harmonious, matched, miscible, mixable

Antonym: incompatible

Encyclopedia: Compatible