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The Collaborative International Dictionary of English v.0.48 (gcide)

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]

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单词	字典	翻译
Lemmata	查看　Lemmata　在百度字典中的解释	百度英翻中〔查看〕
Lemmata	查看　Lemmata　在Google字典中的解释	Google英翻中〔查看〕
Lemmata	查看　Lemmata　在Yahoo字典中的解释	Yahoo英翻中〔查看〕