Definition of "ounce" in English

noun

1. An avoirdupois ounce, weighing ¹⁄₁₆ of an avoirdupois pound, or 28.349523125 grams.

2. A troy ounce, weighing ¹⁄₁₂ of a troy pound, or 480 grains, or 31.1034768 grams.

3. A US fluid ounce, with a volume of ¹⁄₁₆ of a US pint, 1.804688 cubic inches or 29.5735295625 millilitres.

4. A British imperial fluid ounce, with a volume of ¹⁄₂₀ of an imperial pint, 1.733871 cubic inches or 28.4130625 millilitres.

5. (figurative) Any small amount, a little bit.

   • He didn't feel even an ounce of regret for his actions.

noun

1. (archaic) A large wild feline, such as a lynx or cougar.

2. Synonym of snow leopard, Panthera uncia.

3. (cryptozoology) Synonym of onza, a particularly aggressive cougar or jaguarundi in Mexican folklore.