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English definition of “fluid ounce”

fluid ounce

noun [C]     (written abbreviation fl oz) old-fashioned
a measurement of liquid equal to UK 0.024 or US 0.030 of a litre Measurements of volumeGeneral words for size and amountInformal measurements of volume
(Definition of fluid ounce noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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