Lemma (from Ancient Greek premise, assumption, from Greek I take, I get) may refer to:
Language and linguistics Lemma (morphology), the canonical, dictionary or citation form of a word Lemma (psycholinguistics), a mental abstraction of a word about to be uttered
Science and mathematics Lemma (botany), a part of a grass plant Lemma (mathematics), a proven proposition used as a step in a larger proof
Other uses Lemma (album), by John Zorn (2013)
See also Analemma, a diagram showing the variation of the position of the Sun in the sky Dilemma Lema (disambiguation) Lemmatisation Neurolemma, part of a neuron