1. a subsidiary proposition that is assumed to be true in order to prove another proposition;

2. the lower and stouter of the two glumes immediately enclosing the floret in most Gramineae;

[syn:

3. the heading that indicates the subject of an annotation or a literary composition or a dictionary entry;

The Collaborative International Dictionary of English v.0.48:

Lemma \Lem"ma\ (l[e^]m"m[.a]), n.; pl. L. Lemmata (-m[.a]*t[.a]), E. Lemmas (-m[.a]z). [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]The Collaborative International Dictionary of English v.0.48:

main entry word \main entry word\ n. The form of a word that heads a lexical entry and is alphabetized in a dictionary; also called entry word, headword, and lemma. Syn: citation form, entry word, headword, lemma. [WordNet 1.5] Note: In different languages, different wordforms, such as cases for verbs, may be taken as the main entry word. In English dictionaries, it is the infinitive form, but in latin dictionaries it is usually the first person singular present. [PJC]WordNet (r) 3.0 (2006):

lemma n 1: a subsidiary proposition that is assumed to be true in order to prove another proposition 2: the lower and stouter of the two glumes immediately enclosing the floret in most Gramineae [syn: lemma, flowering glume] 3: the heading that indicates the subject of an annotation or a literary composition or a dictionary entryThe Free On-line Dictionary of Computing (30 December 2018):

lemmaA result already proved, which is needed in the proof of some further result. (1995-03-25)