A complete definition supplies all necessary conditions that are jointly sufficient

Evidence

The issue of the completeness of conceptualization arises most clearly and visibly in the philosophical approach to conceptualization. Going all the way back to Aristotle, a good definition is complete in that it provides all the necessary conditions that are jointly sufficient for the concept. It is complete because there are no missing important, necessary dimensions. It is complete in the sense that together they are jointly sufficient. — Gary Goertz, Social Science Concepts and Measurement, 184

Categorization

• DEFINE: States the classical necessary-and-sufficient criterion for conceptual completeness traceable to Aristotle.