Transaction account. Transaction accounts include those accounts described in 12 U.S.C. 461(b)(1)(C), money market accounts and similar accounts that take deposits and are subject to withdrawal by check or other negotiable order.
31 CFR § 1010.100
When used in this chapter and in forms prescribed under this chapter, where not otherwise distinctly expressed or manifestly incompatible with the intent thereof, terms shall have the meanings ascribed in this subpart. Terms applicable to a particular type of financial institution or specific part or subpart of this chapter are located in that part or subpart. Terms may have different meanings in different parts or subparts.