Cite as: 540 U. S. 20 (2003)
Opinion of the Court
concluding that whether Thomas's old job exists is irrelevant under the SSA's regulations. Thomas v. Apfel, Civ. No. 99-2234 (Aug. 17, 2000). The Court of Appeals for the Third Circuit, sitting en banc, reversed and remanded. Over the dissent of three of its members, it held that the statute unambiguously provides that the ability to perform prior work disqualifies from benefits only if it is "substantial gainful work which exists in the national economy." 294 F. 3d 568, 572 (2002). That holding conflicts with the decisions of four other Courts of Appeals. See Quang Van Han v. Bowen, 882 F. 2d 1453, 1457 (CA9 1989); Garcia v. Secretary of Health and Human Services, 46 F. 3d 552, 558 (CA6 1995); Pass v. Chater, 65 F. 3d 1200, 1206-1207 (CA4 1995); Rater v. Chater, 73 F. 3d 796, 799 (CA8 1996). We granted the SSA's petition for certiorari. 537 U. S. 1187 (2003).
II
As relevant to the present case, Title II of the Act defines "disability" as the "inability to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment which can be expected to result in death or which has lasted or can be expected to last for a continuous period of not less than 12 months." 42 U. S. C. § 423(d)(1)(A). That definition is qualified, however, as follows:
"An individual shall be determined to be under a disability only if his physical or mental impairment or impairments are of such severity that he is not only unable to do his previous work but cannot, considering his age, education, and work experience, engage in any other kind of substantial gainful work which exists in the national economy. . . ." § 423(d)(2)(A) (emphases added).
"[W]ork which exists in the national economy" is defined to mean "work which exists in significant numbers either in the
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