American English

Definition of ounce noun from the Oxford Advanced American Dictionary



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  1. 1[countable] (abbreviation oz.) a unit for measuring weight, 1/16 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. Idioms
    an ounce of prevention is better than a pound of cure (saying)
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    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 Learner's Dictionary entry: ounce