1 [lem-uh]
noun, plural lemmas, lemmata [lem-uh-tuh] .
a subsidiary proposition introduced in proving some other proposition; a helping theorem.
an argument, theme, or subject, especially when indicated in a heading.
a word or phrase that is glossed; headword.

1560–70; < Latin: theme, title, epigram < Greek lêmma something received, premise, akin to lambánein to take, receive, take for granted

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2 [lem-uh] .
noun, plural lemmas. Botany.
a bract in a grass spikelet just below the pistil and stamens.

1745–55; < Greek lémma shell, husk, akin to lépein to peel

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lemma1 (ˈlɛmə)
n , pl -mas, -mata
1.  a subsidiary proposition, proved for use in the proof of another proposition
2.  linguistics a word considered as its citation form together with all the inflected forms. For example, the lemma go consists of go together with goes, going, went, and gone
3.  an argument or theme, esp when used as the subject or title of a composition
[C16 (meaning: proposition), C17 (meaning: title, theme): via Latin from Greek: premise, from lambanein to take (for granted)]

lemma2 (ˈlɛmə)
n , pl -mas, -mata
Compare palea the outer of two bracts surrounding each floret in a grass spikelet
[C19: from Greek: rind, from lepein to peel]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1560s, first in mathematics, from Gk. lemma (pl. lemmata) "something received or taken; an argument; something taken for granted," from root of lambanein "to take" (see analemma).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
lemma   (lěm'ə)  Pronunciation Key 
Plural lemmas or lemmata (lěm'ə-tə)
The outer or lower of the two bracts enclosing one of the flowers within a grass spikelet.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

lemma definition

A result already proved, which is needed in the proof of some further result.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Di-lemma is a double lemma, or two-edged sword which strikes either way.
The lowest lemma is smooth toward the base and slightly rough toward the tip.
Lemma narrow, gradually tapering to a point and awned from a bifid apex.
This lemma is sometimes called the product rule for probabilities.
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