lemma
lemma
Greek
“Surprisingly, lemma was once a gift before it was a word form.”
Ancient Greek had the noun lēmma, "a thing taken or received." In 3rd century BCE Alexandria, Euclid used lēmma for an assumed proposition that supports a proof. By the 1st century CE, grammarians such as Dionysius Thrax used the term for a base word form in analysis. The word already carried the idea of a starting point.
Late Latin kept the term as lemma, used in scholarly notes and logical treatises. In the 12th century, Latin school traditions spread it through cathedral schools in Paris. The term stayed technical, tied to manuscripts and marginalia. It remained stable in spelling and sound.
English absorbed lemma in the 16th century through Renaissance logic and grammar. Thomas Wilson used it in 1553 when describing parts of a proof. By the 19th century, dictionaries used lemma for the headword under which inflected forms are listed. The sense narrowed to a precise technical label.
Modern linguistics and mathematics retained lemma with little change. It now names a preliminary result or a dictionary headword. The survival is steady because it fills a narrow, useful slot. The word's path shows how a "thing taken" became a formal starting point.
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Today
Lemma is a technical noun in English. It most often means a preliminary theorem used to prove a larger result, or the dictionary headword under which inflected forms are listed.
The word keeps a formal tone in mathematics, logic, and linguistics. It names the starting point that makes later reasoning possible. A small hinge of meaning. It starts the proof.
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