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The old Italian word for ounce, onzia, derives from the Latin "uncia", meaning one twelfth. The original Roman libra (from which we derive the abbreviation "lb" for pounds) was divided into twelfths, each of which was one ounce (or 1oz).

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14y ago
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16y ago

The abbreviation "oz" comes from the old Italian word "onza" (now spelled oncia), meaning ounce.

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14y ago

Because it is.

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Q: Why is the word ounce abbrievated oz?
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