Lemma

Lemma may refer to:
 Lemma (mathematics), a proven statement that is used to prove another statement
 Lemma (linguistics), the canonical form of a word. They are the head words in a dictionary.
 Lemma (logic), which is simultaneously a premise for a contention above it and a contention for premises below it
 Lemma (botany), one of the specialised bracts enclosing a floret in a grass inflorescence
 "Shadowing lemma", a fictional animal in Terry Pratchett's Discworld series, which exists in only 2 dimensions and eats mathematicians