lemma

Inflections of 'lemma' (n):

lem•ma¹ n., pl. lem•mas, lem•ma•ta

a subsidiary proposition introduced in proving some other proposition;
a helping theorem.
an argument, theme, or subject, esp. when indicated in a heading.
Linguisticsa word or phrase that is glossed;
headword.

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

lem•ma² n., pl. lem•mas. [Bot.]

Collins Concise English Dictionary © HarperCollins Publishers::

lemma /ˈlɛmə/ n ( pl -mas, -mata /-mətə/)

a subsidiary proposition, proved for use in the proof of another proposition
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
an argument or theme, esp when used as the subject or title of a composition

Etymology: 16th Century (meaning: proposition), C17 (meaning: title, theme): via Latin from Greek: premise, from lambanein to take (for granted)

'lemma' also found in these entries (note: many are not synonyms or translations):

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