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The word "lemma" is most commonly used in the context of linguistics and mathematics. In linguistics, a lemma refers to the base form of a word, which is used to represent all its inflected forms. For example, the lemma form of the word "run" would be "run," and it would be used to represent "runs," "running," "ran," etc. In mathematics, a lemma refers to a preliminary or auxiliary theorem that is used to prove a more important theorem. It is like a stepping stone on the way to proving something else. Overall, the word "lemma" is not commonly used in everyday conversation and is most commonly used in academic and technical fields.