A closed concept is a concept where all the necessary and sufficient conditions required to include something within the concept can be listed. For example, the concept of a triangle is closed because it is a three-sided polygon, and only a three-sided polygon, is a triangle. All the conditions required to call something a triangle can be, and are, are listed.
Its opposite is an "open concept".
- Open and Closed Concepts and the Continuum Fallacy - More on open and closed concepts
- Necessary Conditions and Sufficient Conditions - A guide to the usage and application of necessary and sufficient conditions
Original source: https://en.wikipedia.org/wiki/Closed concept. Read more