Compatibility

noun

1. The quality of being compatible.
2. The quality or power of being compatible or congruous; congruity.

   "a compatibility of tempers; a compatibility of properties"

3. The state of being compatible; in which two or more things are able to exist or perform together in combination without problems or conflict.
4. the capability of two or more items or components of equipment or material to exist or function in the same system or environment without mutual interference.
5. the ability to execute a given program on different types of computers without modification of the program or the computers. See backward compatibility and forward compatibility.