uncia

uncia
   1. a Latin name for the fraction 1/12, subsequently used in many ways to represent a twelfth part. The Romans had no mathematical notation for fractions. When they needed to refer to a fractional part of anything, they would often state its nearest equivalent in unciae.
   2. the Roman ounce, equal to about 27.2875 grams or 0.9625 ounce avoirdupois. There were 12 ounces in a Roman pound, and the word uncia means a 12th part; its name gives us both the ounce and the inch.
   3. the Roman inch, equal to about 2.473 centimeters or 0.9734 English inch.

Dictionary of units of measurement. 2015.

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