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proof spirit

proof spir·it


noun 
Definition:
 
standard for measuring alcoholic strength: an alcoholic beverage or a mixture of alcohol and water. In the United Kingdom and Canada proof spirit is 57.1 percent alcohol by volume at 10.6° C (51° F), while in the United States, it is 50 percent alcohol at 15.6° C (60° F). Use: formerly, as a standard for measuring alcoholic strength.

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