Cite as: 524 U. S. 624 (1998)
Opinion of the Court
We hold respondent's HIV infection was a disability under subsection (A) of the definitional section of the statute. In light of this conclusion, we need not consider the applicability of subsections (B) or (C).
Our consideration of subsection (A) of the definition proceeds in three steps. First, we consider whether respond-ent's HIV infection was a physical impairment. Second, we identify the life activity upon which respondent relies (reproduction and childbearing) and determine whether it constitutes a major life activity under the ADA. Third, tying the two statutory phrases together, we ask whether the impairment substantially limited the major life activity. In construing the statute, we are informed by interpretations of parallel definitions in previous statutes and the views of various administrative agencies which have faced this interpretive question.
A
The ADA's definition of disability is drawn almost verbatim from the definition of "handicapped individual" included in the Rehabilitation Act of 1973, 87 Stat. 361, as amended, 29 U. S. C. § 706(8)(B) (1988 ed.), and the definition of "handicap" contained in the Fair Housing Amendments Act of 1988, 102 Stat. 1619, 42 U. S. C. § 3602(h)(1) (1988 ed.). Congress' repetition of a well-established term carries the implication that Congress intended the term to be construed in accordance with pre-existing regulatory interpretations. See FDIC v. Philadelphia Gear Corp., 476 U. S. 426, 437-438 (1986); Commissioner v. Estate of Noel, 380 U. S. 678, 681- 682 (1965); ICC v. Parker, 326 U. S. 60, 65 (1945). In this case, Congress did more than suggest this construction; it adopted a specific statutory provision in the ADA directing as follows:
"Except as otherwise provided in this chapter, nothing in this chapter shall be construed to apply a lesser standard than the standards applied under title V of the
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