One of the mysteries of the English language finally explained.
In singular and plural A market day held every eighth (by inclusive reckoning, ninth) day.
Mid 16th century; earliest use found in John Bellenden (c1495–a1548), poet and translator. Originally as plural from classical Latin nundinae, feminine plural (short for nundinae feriae ninth-day holiday), a market day held every ninth day, counting inclusively from novem nine + din- day.
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