ounce

¹ American  

[ouns] / aʊns /

noun

1. a unit of weight equal to 437.5 grains or 1/16 pound (28.35 grams) avoirdupois.

2. a unit of 480 grains, 1/12 pound (31.1 grams) troy or apothecaries' weight.

3. a fluid ounce.

4. a small quantity or portion.

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ounce ² American  

[ouns] / aʊns /

noun

1. snow leopard.

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ounce ¹ British  

/ aʊns /

noun

1.  oz.  a unit of weight equal to one sixteenth of a pound (avoirdupois); 1 ounce is equal to 437.5 grains or 28.349 grams

2. a unit of weight equal to one twelfth of a Troy or Apothecaries' pound; 1 ounce is equal to 480 grains or 31.103 grams

3. short for fluid ounce

4. a small portion or amount

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ounce ² British  

/ aʊns /

noun

1. another name for snow leopard

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ounce Scientific  

/ ouns /

1. A unit of weight in the US Customary System equal to 1/16 of a pound or 437.5 grains (28.35 grams).

2. See Table at measurement

3. See fluid ounce

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ounce Idioms  

More idioms and phrases containing ounce

• more bang for the buck (bounce for the ounce)

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Etymology

Origin of ounce¹

1350–1400; Middle English unce < Middle French < Latin uncia twelfth part, inch, ounce, derivative of unus one

Origin of ounce²

1300–50; Middle English unce lynx < Anglo-French; Old French once, variant of lonce (erroneously taken as l'once the ounce) < Vulgar Latin *luncea, derivative of Latin lync- (stem of lynx ) lynx

Example Sentences

In early European trading, New York gold futures are down 0.8% to $4,748.70 a troy ounce.

From The Wall Street Journal • Apr. 13, 2026

But every once in a while, we get a little wink, an ounce of good luck, an unearned gift, a happy accident, and this recipe falls in that category.

From Salon • Apr. 13, 2026

U.S. stock-index futures ES00 YM00 NQ00 are lower as oil prices CL.1 bounced higher and gold futures GC00 are trading around $4,740 an ounce.

From MarketWatch • Apr. 13, 2026

The State Street strategists argue that gold, currently hovering around $4,800 an ounce, could climb back above $5,000 if oil prices fall to around $80 to $85 a barrel and stay there.

From Barron's • Apr. 10, 2026

“So, first you want to divide the numbers to figure out what the cost per ounce is, then you want...”

From "Auggie & Me" by R. J. Palacio