Lemmatization
Definition
Lemmatization reduces inflected words to their linguistic base form, the lemma.
Unlike simple stemming, it typically considers part of speech and linguistic rules. This allows "ging" and "gehen" to be merged.
Simply explained
How different word forms are traced back to the dictionary entry.
Why it matters in practice
Relevant for classical text search, NLP pipelines, and linguistic analysis.
Example from business
A search pipeline normalizes German inflectional forms before calculating lexical matches.
Limits and pitfalls
- Equating stemming and lemmatization; misconfiguring language model or language.
Origin & history
Lemmatization originates from computational linguistics and morphological analysis and was used long before modern transformer models.
Use in mid-sized companies
- Possible application in SMEs: improve lexical search and classical NLP preprocessing language-specifically.
Frequently asked questions
Is lemmatization always necessary?
No, modern embeddings often do not require it. Is it language-dependent? Yes.
Sources
- Speech and Language Processing · Jurafsky & Martin, Speech and Language Processing
- Ergänzender Primärbeleg · Ergänzender Primärbeleg
Source verification: 10./12.10.2026.
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