A prior section 625, act Aug. 14, 1935, ch. 531, title IV, § 425, as added Pub. L. 90–248, title II, § 240(c), Jan. 2, 1968, 81 Stat. 914; amended Pub. L. 96–272, title I, § 103(a), June 17, 1980, 94 Stat. 519; Pub. L. 103–432, title II, § 202(d)(2), Oct. 31, 1994, 108 Stat. 4454; Pub. L. 105–33, title V, § 5592(a)(1)(B), Aug. 5, 1997, 111 Stat. 644, defined terms for purposes of this subchapter, prior to repeal by Pub. L. 109–288, §§ 6(a), 12 (a), Sept. 28, 2006, 120 Stat. 1244, 1255, effective Oct. 1, 2006, and applicable to payments under this part and part E of this subchapter for calendar quarters beginning on or after such date.

Section effective Oct. 1, 2006, and applicable to payments under this part and part E of this subchapter for calendar quarters beginning on or after such date, without regard to whether implementing regulations have been promulgated, and with delay permitted if State legislation is required to meet additional requirements, see section 12(a), (b) of Pub. L. 109–288, set out as an Effective Date of 2006 Amendment note under section 621 of this title.