Definition
Semantic density is how much relevant meaning a passage carries per word. A dense passage states specific, on-topic information plainly, with little filler between the facts a reader or model came for. It is a measure of signal, not length.Why It Matters for AI Search
Retrieval systems reward passages that answer directly and waste no space. High semantic density makes a passage a strong match for a query and an easy target to quote, because the meaning is concentrated rather than spread across padding. Thin, hedged writing dilutes the signal and gives a model less to grab. Writing with density is a practical way to raise semantic relevance and quotability at once.Related Terms
Semantic relevance
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Information gain
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Semantic search
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Quotability
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Topical completeness
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