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Technical implementation · AI Search Infrastructure
Definition
Query expansion is the process by which an AI system broadens or reformulates a user’s query to retrieve a wider set of relevant documents before generating a response. It involves recognizing synonyms, related concepts, and implicit intent to ensure comprehensive retrieval.
Why It Matters for AI Search
Query expansion means a brand’s content can be retrieved for queries that don’t exactly match its terminology. A brand with strong semantic authority and comprehensive topical coverage benefits from query expansion — its content is retrieved across the full range of related queries, not just the exact phrases it targets. Conversely, content that is semantically thin or uses idiosyncratic terminology may not benefit from query expansion even when it is genuinely relevant.
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