Proof gallon.

Proof gallon. A gallon of liquid at 60 degrees Fahrenheit, which contains 50 percent by volume of ethyl alcohol having a specific gravity of 0.7939 at 60 degrees Fahrenheit (referred to water at 60 degrees Fahrenheit as unity), or the alcoholic equivalent thereof.

Source

27 CFR § 17.11

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Scoping language

As used in this part, unless the context otherwise requires, terms have the meanings given in this section. Words in the plural form include the singular, and vice versa, and words indicating the masculine gender include the feminine. The terms includes and including do not exclude things not listed which are in the same general class.

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