User permit. A permit issued to a person authorizing him to -
(1) Acquire for his own use explosive materials from a licensee in a State other than the State in which he resides or from a foreign country; and
(2) Transport explosive materials in interstate or foreign commerce.
27 CFR § 771.5
When used in this part and in forms prescribed under this part, where not otherwise distinctly expressed or manifestly incompatible with the intent thereof, terms shall have the meaning provided in this subpart. Words in the plural form shall include the singular, and vice versa, and words importing the masculine gender shall include the feminine.