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.
The diagnostic criteria for mental retardation have changed over time.
この法律では、精神発達遅滞を有する者への支援が定められている。
This law provides for support for persons with intellectual disabilities.