WordWeb Online

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

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

Antonym: incompatible

Encyclopedia: Compatible