/owns/, n.1. a unit of weight equal to 437.5 grains or 1/16 pound (28.349 grams) avoirdupois.2. a unit of 480 grains, 1/12 pound (31.103 grams) troy or apothecaries' weight.3. a fluid ounce.4. a small quantity or portion.[1350-1400; ME unce < MF < L uncia twelfth part, inch, ounce, deriv. of unus ONE]ounce2/owns/, n.See snow leopard.[1300-50; ME unce lynx < AF; OF once, var. of lonce (erroneously taken as l'once the ounce) < VL *luncea, deriv. of L lync- (s. of lynx) LYNX]
* * *Unit of weight in the avoirdupois system, the traditional European system of weight, which was incorporated into the British Imperial system and the U.S. system of weights and measures (see measurement).The ounce is equal to 1/16 lb (437.5 grains). In the troy and apothecaries' systems (two other traditional systems of weight), it is equal to 1/12 troy or apothecaries' lb (480 grains). The avoirdupois ounce is equal to 28.35 g, the troy ounce to 31.1 g. As a unit of volume, the fluid ounce is equal to 1/16 of a pint (29.57 ml) in the U.S. system, and to 1/20 of a pint (28.41 ml) in the British Imperial system. See also gram, International System of Units, metric system, pound.
* * *▪ unit of weightunit of weight in the avoirdupois (avoirdupois weight) system, equal to 1/16 pound (437 1/2 grains), and in the troy (troy weight) and apothecaries' (apothecaries' weight) systems, equal to 480 grains, or 1/12 pound. The avoirdupois ounce is equal to 28.35 grams and the troy and apothecaries' ounce to 31.103 grams. As a unit of volume, the fluid ounce is equal to 1/16of a pint, or 29.57 millilitres, in the U.S. Customary System and to 1/20of a pint, or 28.41 millilitres, in the British Imperial System. As a unit of weight, the ounce derives from the Roman uncia (meaning “twelfth part”), which was 1/12 of a Roman foot or ounce. The standard or physical embodiment of the Roman foot, a copper bar, constituted the Roman pound standard and was divided along its length into 12 equal parts, called unciae. Thus, uncia designated both a unit of weight and one of length and is the source of the modern terms inch and ounce.
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