uncia [Latin]

(Plural, unciae.) Literally, “a twelfth part.” The word is the source of the English words “ounce” and “inch,” as well as the names of many units in other languages.

1

An ancient Roman unit of length, a twelfth of a pes, about 24.6 millimeters.link to a table showing relationships between the shorter Roman units of length

2

An ancient Roman unit of weight, a twelfth of a libra, about 27.3 grams.link to a table showing relationships between the Roman units of mass

The Romans had special names for quantities of unciae.

Number of unciae Symbol Special name
1/24th of an uncia   scrupulus
1/12th of an uncia   semisextula
1/6th of an uncia   sextula
1/3rd of an uncia   duella
1/4th of an uncia   sicilicus
half an uncia   semiuncia
1 -  
2 = sextans
3 =- quadrans
4 == trieme
5 ==- quincunx
6 (half a libra) S semis
7 S- septunx
8 S= bes
9 S=- dodrans
10 S== dextans
11 S==- deunx

3

An ancient Roman unit of capacity, a twelfth of a hemina, about 5.5 milliliters. link to a table showing relationships between the smaller Roman units of capacity

4

A ancient Roman unit of land area = 1/12 jugerum.

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