Retardation

Full definition of retardation

(plural retardations)

The act of retarding or delaying; hindrance.
The extent to which anything is retarded; the result of any retarding or delay; mental, social, or physical slowness.
That which retards; an obstacle; an obstruction.
(physics) Deceleration; reduction in the magnitude of velocity.
(music) A suspension which resolves upwards.