In bond. When used with respect to wine or spirits, in bond refers to wine or spirits possessed under bond to secure the payment of the taxes imposed by 26 U.S.C. Chapter 51, and on which such taxes have not been determined. Wine or spirits are considered to be possessed under bond if they are possessed by a proprietor who is liable for the tax, even if the proprietor is not required to provide a bond under this chapter. The term includes any wine or spirits on the bonded wine premises or a distilled spirits plant, or in transit between bonded premises (including in the case of wine, bonded wine premises). Additionally, the term refers to wine withdrawn without payment of tax under 26 U.S.C. 5362 and to spirits withdrawn without payment of tax under 26 U.S.C. 5214 (5) or (a)(13) with respect to which relief from liability has not yet occurred.
27 CFR § 24.10
When used in this part and in the forms prescribed under this part, terms will have the meanings ascribed in this section. Words in the plural form also include the singular, and vice versa, and words indicating the masculine gender also include the feminine. The terms includes and including do not exclude items not enumerated which are in the same general class. The definitions in this section do not supersede or affect the requirements of part 4 of this chapter, relative to the labeling of wine under the provisions of the Federal Alcohol Administration Act (49 Stat. 981; 27 U.S.C. 205).