Definition of ounce noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//aʊns//
    ; NAmE NAmE//aʊns//
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  1. 1[countable] (abbreviation oz) a unit for measuring weight, 116 of a pound, equal to 28.35 grams see also fluid ounce
  2. 2[singular] ounce of something (informal) (used especially with negatives) a very small quantity of something There's not an ounce of truth in her story.
  3. Word OriginMiddle English: from Old French unce, from Latin uncia ‘twelfth part (of a pound or foot)’; compare with inch.Idioms
    prevention is better than cure (British English) (US English an ounce of prevention is better than a pound of cure)
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    (saying) it is better to stop something bad from happening rather than try to deal with the problems after it has happened
See the Oxford Advanced American Dictionary entry: ounce