Uncia (unit)

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An uncia (plural: unciae) is an ancient Roman unit of length equal to 1/12 of a Roman foot. One uncia, which roughly corresponds to an inch, is 0.97 inches or 24.6 millimeters. There are twelve unciae in one pes, another Roman measure of length.

The words inch (1/12 of a foot) and ounce (originally 1/12 of a pound and still 1/12 of a troy pound) are derived from the word uncia.

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