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Explanation: In English we use "proof," which is the percent alcohol content multiplied by two. Therefore, a 14 proof beverage would be 7% alcohol by volume. I believe that a "grado" is the actual percent alcohol content. My only doubt is that 7% seems rather high for beer.
ex. from a drink recipe website:Grado Alcoholico: 14º GL (28º Proof).
Explanation: This would be "seven-percent beer". For weaker alcoholic beverages percentage is used, for stronger ones, proof. Proof is approximately twice percentage —I won't go into exactly how it's calculated— and the stronger the spirit, the more it deviates from twice.