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were based on a duodecimal system. From 1/12 to 8/12 they were expressed as multiples of twelfths (uncia "twelfth"; the source of the English words inch and ounce) and from 9/12 to 11/12 they were expressed as multiple twelfths less than the next whole unit--i.e. a whole unit less 3/12, 2/12 or 1/12 respectively. There were also special terms for quarter (quadrans), half (semis), and three-quarters (dodrans).

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