- Circular (reasoning)(as used in logic and epistemology)
- A logical mistake where you prove something by assuming it's already true—like saying 'this is important because it's important.'
- George Dickie(as the originator of the institutional theory of art)
- A 20th-century American philosopher who developed new ideas about what makes something art, focusing on the role of the art world and institutions rather than just how things look or feel.
- Institutional theory(as a theory about what defines art)
- The idea that something counts as art because the art world—museums, galleries, critics, artists—treats it as art, rather than because of what it physically is.
- Irremediably(as a description of the severity of the circular problem)
- In a way that cannot be fixed or corrected; hopelessly or beyond repair.
- Phenomenological definitions(as definitions that focus on personal experience)
- Attempts to define something (like art or beauty) based on how it actually appears to our senses and feelings when we experience it directly.
- Structural problem(contrasting with incidental problems)
- A flaw built into the basic framework or foundation of an idea, rather than just a minor mistake that could be easily fixed.
- The aesthetic(as the subject of philosophical definitions)
- The quality of being beautiful, artistic, or related to how something looks and feels when we experience it.