ounce

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. (figuratively)Any small amount, a little bit.

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

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

   “The Ounce or the vvilde Cat, is as big as a mungrell dog, this creature is by nature feirce, and more dangerous to bee met vvithall than any other creature, not fearing eyther dogge or man; […]”

   “Halloa! another prey, The nimble Antelope! The ounce is freed; one spring, And his talons are sheath’d in her shoulders, And his teeth are red in her gore.”

7. Synonym of snow leopard, Panthera uncia.
8. Synonym of onza, a particularly aggressive cougar or jaguarundi in Mexican folklore.

   “The ounce, a leopard-like creature, is dreaded for its depredations by the Indians of Brazil.”