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lemma (n.)

1560s, in mathematics, from Greek lemma (plural lemmata) "something received or taken; an argument; something taken for granted," from root of lambanein "to take," from PIE root *(s)lagw- "to seize, take" (source also of Sanskrit labhate, rabhate "seizes;" Old English læccan "to seize, grasp;" Greek lazomai "I take, grasp;" Old Church Slavonic leca "to catch, snare;" Lithuanian lobis "possession, riches"). Related: Lemmatical.

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Definitions of lemma from WordNet

lemma (n.)
a subsidiary proposition that is assumed to be true in order to prove another proposition;
lemma (n.)
the lower and stouter of the two glumes immediately enclosing the floret in most Gramineae;
Synonyms: flowering glume
lemma (n.)
the heading that indicates the subject of an annotation or a literary composition or a dictionary entry;
From wordnet.princeton.edu