(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.
An ancient Roman unit of length, a twelfth of a pes, about 24.6 millimeters.
An ancient Roman unit of weight, a twelfth of a libra, about 27.3 grams.
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|
|6 (half a libra)||S||semis|
An ancient Roman unit of capacity, a twelfth of a hemina, about 5.5 milliliters.
A ancient Roman unit of land area = 1/12 jugerum.
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Last revised: 16 Marchl 2011.