20 USC 1087ii - Definitions

(a) Low-income communities 
For the purpose of this part, the term low-income communities means communities in which there is a high concentration of children eligible to be counted under title I of the Elementary and Secondary Education Act of 1965 [20 U.S.C. 6301 et seq.].
(b) High-risk children 
For the purposes of this part, the term high-risk children means individuals under the age of 21 who are low-income or at risk of abuse or neglect, have been abused or neglected, have serious emotional, mental, or behavioral disturbances, reside in placements outside their homes, or are involved in the juvenile justice system.
(c) Infants, toddlers, children, and youth with disabilities 
For purposes of this part, the term infants, toddlers, children, and youth with disabilities means children with disabilities and infants and toddlers with disabilities as defined in sections 1401 and 1432 of this title, respectively, and the term qualified professional provider of early intervention services has the meaning specified in section 1472 (2)1 of this title.
[1] See References in Text note below.