The word "retardation" refers to a condition where someone shows slower progress or development compared to others. It is commonly used to describe a delay in learning, understanding, or performing tasks. Full definition
Other cognitive diseases linked to paternal age include mental retardation of unknown etiology and Alzheimer's disease, and there is a strong relationship between paternal age and autism.» (schizophrenia.com)
Having a history of preterm birth, toxemia, or intrauterine growth retardation in a prior pregnancy may also raise risk. (verywellfamily.com)
I spent the next few years working in nursing homes and working for the Department of Mental Retardation in (nhsma.org)