Information Retrieval

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5 domain-specific abstractions whose origin domain is Information Retrieval.

• Concept search — Information retrieval that ranks unstructured documents by semantic similarity to the ideas expressed in a query rather than exact word overlap alone.
• Inverted index — An information-retrieval index mapping each content term or feature to the documents and positions in which it occurs.
• Proximity search (text) — An information-retrieval query requiring separately matching terms to occur within a specified textual distance, optionally in a specified order.
• Relevance (information retrieval) — The degree to which retrieved information satisfies a user’s information need within a task and context.
• Retrievability — A document-centric information-retrieval measure of how broadly and prominently a fixed system exposes an information object across a declared population of queries.