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Etymology 1[edit]

From Middle French once, from Latin uncia (1/12 part), from ūnus (one). Doublet of inch.


ounce (plural ounces) abbreviation oz. or

  1. An avoirdupois ounce, weighing 1/16 of an avoirdupois pound, or 28.3495 grams.
  2. A troy ounce, weighing 1/12 of a troy pound, or 480 grains, or 31.1035 grams.
  3. A US fluid ounce, with a volume of 1/16 of a US pint, 1.804 687 cubic inches or 29.573 531 milliliters.
  4. A British imperial fluid ounce, with a volume of 1/20 of an imperial pint, 1.733871 cubic inches or 28.413063 millilitres.
  5. A little bit.
    He didn't feel even an ounce of regret for his actions.
Related terms[edit]

Etymology 2[edit]

From French once, from lonce (lynx), by false division (the l was thought to be the article), from Latin lynx, from Ancient Greek λύγξ (lúnx, lynx). Interestingly, the taxon of the snow leopard is a Latinisation using the root of ounce.


ounce (plural ounces)

  1. The snow leopard, Uncia uncia.