Register and registration refer only to registration required and permitted by sections 303 or 1007 of the Act (21 U.S.C. 823 or 957).
21 CFR § 1300.02
Any term not defined in this part shall have the definition set forth in section 102 of the Act (21 U.S.C. 802), except that certain terms used in part 1316 of this chapter are defined at the beginning of each subpart of that part.