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Core concept · AI Search Infrastructure

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Definition

The semantic center of gravity is the dominant conceptual direction of a passage’s embedding vector. A passage with a single, clear semantic center produces an embedding that points consistently toward one cluster in vector space. A passage with multiple competing topics has a diffuse embedding pulled in multiple directions simultaneously. The semantic center of gravity is the mechanism behind the structural rule of one question per section. A passage can be long and technically detailed, as long as everything in it contributes to the same conceptual direction. The moment a section begins addressing a second question, the embedding starts drifting — the vector moves away from the first cluster without fully entering the second. Both retrieval targets suffer.

Semantic density

Embedding drift

Topic coherence

Embedding

Cosine similarity

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