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The Collaborative International Dictionary
lemmatization

lemmatization \lem`ma*tiz*a"tion\ (l[e^]m`m[.a]*t[i^]z*[=a]"sh[u^]n), v. t. The act or process of lemmatizing; conversion into a lemma[2].

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Wiktionary
lemmatization

n. (alternative spelling of lemmatisation English)