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].
Note: Lemmatization of search words in a computerized Information Retrieval System may allow more effective retrieval of documents of interest to the searcher.
Wiktionary
lemmatization
n. (alternative spelling of lemmatisation English)