(755 ILCS 5/11a-1) (from Ch. 110 1/2, par. 11a-1)
    Sec. 11a-1. "Developmental disability", "intellectual disability", and "related condition" defined.
    "Developmental disability" means a disability that is attributable to an intellectual disability or a related condition.
    "Intellectual disability" means significantly subaverage general intellectual functioning existing concurrently with deficits in adaptive behavior and manifested before the age of 22 years.
    "Related condition" means a condition that:
        (1) is attributable to cerebral palsy, epilepsy, or
any other condition, other than mental illness, found to be closely related to an intellectual disability because that condition results in impairment of general intellectual functioning or adaptive behavior similar to that of individuals with an intellectual disability, and requires treatment or services similar to those required for those individuals. For purposes of this Act, autism is considered a related condition;
        (2) is manifested before the individual reaches age
        (3) is likely to continue indefinitely; and
        (4) results in substantial functional limitation in 3
or more of the following areas of major life activity: self-care, language, learning, mobility, self-direction, and capacity for independent living.
(Source: P.A. 102-72, eff. 1-1-22; 102-109, eff. 1-1-22.)