Definition of "ounce" []

• A unit of weight in the U.S. Customary System, an avoirdupois unit equal to 437.5 grains (28.35 grams). (noun)
• A unit of apothecary weight, equal to 480 grains (31.10 grams). See Table at measurement. (noun)
• A fluid ounce. See Table at measurement. (noun)
• A tiny bit: not an ounce of sympathy. (noun)
• See snow leopard. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Your contention that limited exposure to federal law enforcement justifies not carrying a card that weighs less than an ounce is quite odd as well."
• "The flight to gold, now at $1,309 an ounce, is another symptom of the same disease."
• "Argument: Some Wall Street analysts claim $1,000 an ounce is too high for gold."