Hybrid Retrieval

Hybrid Retrieval combines lexical retrieval (BM25, word matching) with semantic retrieval (embeddings, meaning understanding), used by Google.

Think of Google as a two-stage exam — multiple choice test (lexical retrieval, fast) plus oral interview (semantic retrieval and reranking, thorough). Optimizing for keywords alone means optimizing for half the process. You need to be strong in both: use keywords AND cover the semantic field.

Hybrid Retrieval explains why both keyword SEO and semantic SEO are right — but neither alone is sufficient. In practice, use exact keyword phrases in every article (for BM25) AND synonyms, hyponyms, and meronyms (for embeddings). Lexical expansion tools generate extensions automatically. The result is broader query matching without keyword stuffing.