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English definition of “ounce”

ounce

noun     /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 Measurements of weight and mass 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 Measurements of weight and mass 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's got an ounce of common sense , he'll realize that this project is bound to fail .Words meaning small pieces and amounts
(Definition of ounce noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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