what is lemma

[stakeMyHeart]

im trying to study this paper http://ww2.cs.mu.oz.au/~tim/pubs/austai2009.pdf
its all about putting proper capitalization and punctuation in an english text. As I was reading it I encountered this word, lemma. I searched it on google and found ambigous results. It came to my mind that it must be lemmatization. But lemmatization is getting the rootword but in the usage in the paper it seems not proper.

I want to know what this lemma means. And also, if you have something in mind about other methods in this topic please share it to me.

please help me. thanks.

[firstPerson]

Usually, think of lemma as a fact. Its like a theorem but just not as big fact.

[nezachem]

In this context, lemma is a dictionary form of a word.

[stakeMyHeart]

thank you guys!