Lemma
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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