Definition of “ounce” - English Dictionary

“ounce” in British English

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ouncenoun

uk /aʊns/ us /aʊns/

C1 [ C ] written abbreviation oz a unit of weight equal to approximately 28 grams:

There are 16 ounces in one pound.
a twelve-oz pack of bacon

C2 [ S ] informal a very small amount:

She can eat as much as she wants and she never puts on an ounce (= her weight does not increase).
If he has an ounce of common sense, he'll realize that this project is bound to fail.

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(Definition of “ounce” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“ounce” in American English

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ouncenoun [ C ]

us /ɑʊns/ abbreviation oz.

ounce noun [ C ] (WEIGHT)

a unit of measurement of weight equal to 1/16 pound or 28 grams

An ounce is also a very small amount:

If he’s got an ounce of common sense, he’ll realize that this project is bound to fail.

ounce noun [ C ] (VOLUME)

a fluid ounce

(Definition of “ounce” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“ounce” in Business English

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ouncenoun [ C ]

uk /aʊns/ us written abbreviation oz

[ C ] MEASURES a unit of weight equal to 28.35 grams:

There are 16 ounces in one pound.
a 12-oz can of cola

(Definition of “ounce” from the Cambridge Business English Dictionary © Cambridge University Press)