Definitions
from The Century Dictionary.
 noun In logic:
 noun In the Stoical logic
 noun The major premise of a hypothetical syllogism, or modus ponens: thus, in the reasoning, “If it is day, it is light; but it is day: hence, it is light,” the first premise was called the lemma.
 noun A premise in general.
 noun A Megaric sophism depending on the question whether a man who says “I am lying” is truly lying or not.
 noun In mathematics, a proposition upon which it is necessary to arrest the attention for the sake of proving an ulterior one, but which interrupts the regular series of theorems; also, a premise drawn from another branch of mathematics than that under consideration.
 noun A theme; a thesis; the subject of an epigram, or of a musical composition, etc.
 noun In embryology, the primary or outer layer of the germinal vesicle. Pascoe.
from the GNU version of the Collaborative International Dictionary of English.
 noun (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.
 noun A word that is included in a glossary or list of headwords; a headword.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun mathematics A
proposition proved oraccepted for immediate use in theproof of some other proposition.  noun linguistics, usually The
canonical form of an inflected word.  noun linguistics, less frequently A
lexeme ; all the inflected forms of a term.  noun botany One of the specialized
bracts around thefloret ingrasses .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun the lower and stouter of the two glumes immediately enclosing the floret in most Gramineae
 noun a subsidiary proposition that is assumed to be true in order to prove another proposition
 noun the heading that indicates the subject of an annotation or a literary composition or a dictionary entry
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
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Examples

Obviously, such a number would be far too large to manipulate readily, so, using a formula familiar to statisticians, it was normalized to produce a simple decimal number of only a few digits which I called the lemma's Exposure Index.

Emblem included a motto, called lemma, an image, and an epigram.
ICONOGRAPHY JAN BIA��OSTOCKI 1968

When no manuscripts are specified for the lemma in an entry, the lemma is the reading for those manuscripts not otherwise specified.
The Last Poems of Ovid 43 BC18? Ovid

(A lemma is the word under which a set of related dictionary or encyclopedia entries appears.)

The short article discussion started in a wideranging discussion at not include what Chris and I have called the "lemma" problem because we didn't a good handle, and Larry wanted an actionable proposal.
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

For the latter, the "lemma" idea is still soft and in need of refinement; remember that this is a proposal that will produce instructions for the general CZ user.
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

For the latter, the "lemma" idea is still soft and in need of refinement; remember that this is a proposal that will produce instructions for the general CZ user.
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

"lemma" idea is still soft and in need of refinement; remember that this is a proposal that will produce instructions for the general CZ user.
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

"lemma" idea is still soft and in need of refinement; remember that this is a proposal that will produce instructions for the general CZ user.
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

"lemma" idea is still soft and in need of refinement; remember that this is a proposal that will produce instructions for the general CZ user.
Citizendium, the Citizens' Compendium  Recent changes [en] 2009
sionnach commented on the word lemma
Jane Austen's little known contribution to the discipline of Logic.
February 8, 2008
john commented on the word lemma
Plural of lemming.
February 5, 2010
reesetee commented on the word lemma
Wouldn't that be a dilemma?
*dodges tomatoes*
February 6, 2010
biocon commented on the word lemma
In addition, lemma means 1. the husk or shell of a fruit; 2. the lower bract of a floret of a grass; 3. the external layer of the germinal vesicle (Oxford English Dictionary). Moreover, lemma signifies the external covering of an anatomical or biological structure. Examples are plasmalemma, the plasma membrane of any cell, and sarcolemma, the outer membrane of a myocyte (cell of a muscle).
July 1, 2011
nayanlaldas commented on the word lemma
it's my cousin's name....
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January 15, 2012