The process of making something slower.
Slowed or incomplete development or function.
The slowing up of a process. The term mental retardation is used as a synonym for mental sub-normality; it implies that the sub-normality is regarded as a delay in development rather than a qualitative defect. Psychomotor retardation is a marked slowing down of activity and speech, which can reach a degree where a patient can no longer care for himself. It is a symptom of severe depression.
The deceleration of a process. The term “mental retardation” was previously frequently employed to denote compromised intellectual growth.