noun
mental retardation; intellectual disability
Clinical term; in modern usage, 知的障害 (ちてきしょうがい) is often preferred as a less stigmatizing expression. This term may still appear in older medical or legal contexts.
精神発達遅滞の診断基準は時代とともに変化してきた。
The diagnostic criteria for mental retardation have changed over time.
This law provides for support for persons with intellectual disabilities.