LRE is an acronym that stands for least restrictive environment. IDEA does not define “least restrictive environment” in its definitions section. However, it requires that each student receive special education and related services in the “least restrictive environment” and describes what this means.
Least Restrictive Environment (LRE) is a requirement of the Individuals with Disabilities Education Act (IDEA) for all children, including preschool children with disabilities. Because providing preschool classes is not a requirement for local education agencies, finding natural environments for preschool-aged children with disabilities to receive special education services can be a challenge for school districts. […]