Definition of "retardation"

The act of retarding or delaying; hindrance.

1. (acoustics) The distance by which one wave is behind another.  examples

2. (music) The act of diminishing the rate of speed.  examples

3. (telegraphy) A decrease in the speed of telegraph signalling.  examples

The extent to which anything is retarded; the result of any retarding or delay; mental, social, or physical slowness.  examples

(colloquial, derogatory, offensive) Extreme stupidity.  examples

That which retards; an obstacle; an obstruction.  examples

(physics) Deceleration; reduction in the magnitude of velocity.  quotations  examples

(music) A suspension which resolves upwards.  examples