|Origin:||unce, from Latin uncia 'twelfth part, ounce'|
ounce S3 [countable] written abbreviation oz
a unit for measuring weight, equal to 28.35 grams. There are 16 ounces in a pound. ➔ fluid ounce
any sense, truth etc at all:
If you had an ounce of sense you wouldn't believe him!
all the courage, energy etc that you have:
Every ounce of attention was focused on our common goal.
used to say that it is better to prevent a problem before it happens than to try to solve it after it has happened
if there is not an ounce of fat on someone, they are thin and usually look healthy