Abstract

This paper constitutes a foundational extension of The Principles of Defining Philosophy. Building upon the established epistemology centered on “Definition” with “Comparison” as its meta-operation, its core aim is to construct the ontological foundation. This involves clarifying the process of Sensory Compilation from the Essence of Existence to the Concept of Existence, and demonstrating that Distortion is a necessary and ineliminable property inherent in this conversion and in all subsequent operations of Narrow Definition. From this foundation, the paper proposes and rigorously argues for the Theorem of Multi-Subjective World Cross-Verification, providing an operational criterion based on definitional practice for core ontological commitments and for social reality. Ultimately, by incorporating the theory itself without exception into its analytical framework, achieving a logically self-consistent self-reference, the paper completes the closure of the Defining Philosophy system.