n.; pl. L. Lemmata E. Lemmas [ L. lemma, Gr. lh^mma anything received, an assumption or premise taken for granted, fr. lamba`nein to take, assume. Cf. Syllable. ] 1. (Math., Logic) A preliminary or auxiliary proposition demonstrated or accepted for immediate use in the demonstration of some other proposition, as in mathematics or logic. [ 1913 Webster ]

2. A word that is included in a glossary or list of headwords; a headword. [ PJC ]

n. A leman. [ Obs. ] Chaucer. [ 1913 Webster ]

v. t. The act or process of lemmatizing; conversion into a lemma{ 2 }. [ PJC ]

☞ Lemmatization of search words in a computerized Information Retrieval System may allow more effective retrieval of documents of interest to the searcher. [ PJC ]

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 ]