Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: unce, from Latin uncia 'twelfth part, ounce'

ounce

noun
     
Related topics: Measurement
ounce S3 [countable] written abbreviation oz
1TM a unit for measuring weight, equal to 28.35 grams. There are 16 ounces in a pound. fluid ounce
2

an ounce of sense/truth/decency etc

any sense, truth etc at all:
If you had an ounce of sense you wouldn't believe him!
3

every (last) ounce of courage/energy/strength etc

all the courage, energy etc that you have:
Every ounce of attention was focused on our common goal.
4

an ounce of prevention (is worth a pound of cure)

used to say that it is better to prevent a problem before it happens than to try to solve it after it has happened
5

not an ounce of fat (on somebody)

if there is not an ounce of fat on someone, they are thin and usually look healthy

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