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• n  one part in twelve equal parts
• s  based on twelve
  the duodecimal number system

• No English wives who bore children on the duodecimal system learned that any protection existed.
• But there are other ways of counting as well, by twelves, say, as in the hours of the day or months of the year (the duodecimal system).

• one-twelfth
• twelfth
• twelfth part