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The Collaborative International Dictionary of English v.0.48:

lemmatize \lem"ma*tize\ (l[e^]m"m[.a]*t[imac]z`), v. t. To convert into a lemma[2]; to normalize the form of (a word) to that form used as the headword in a dictionary, glossary, or index; as, "ride" is the lemmatized form for "riding" and "ridden". [PJC]