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In page Motet:

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In the early 20th century, it was generally believed the name came from the Latin movere ("to move"), though a derivation from the French mot ("word", or "phrase"), had also been suggested. The Medieval Latin for "motet" is motectum, and the Italian mottetto was also used.[1] If the word is from Latin, the name describes the movement of the different voices against one another. Today, however, the French etymology is favoured by reference books, as the word "motet" in 13th-century French had the sense of "little word".[2][3][4][5] In fact, the troped clausulas that were the forerunner of the motet were originally called motelli (from the French mot, "word"), soon replaced by the term moteti.[6]