What is "lemmatize"

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''.

alt. (context linguistics English) To convert an inflected form of a lexeme to a lemm

1. v

2. (context linguistics English) To convert an inflected form of a lexeme to a lemma.