What is the meaning of Retardation?

The act of retarding or delaying; hindrance.

1. The distance by which one wave is behind another.
2. The act of diminishing the rate of speed.
3. A decrease in the speed of telegraph signalling.

The distance by which one wave is behind another.

The act of diminishing the rate of speed.

A decrease in the speed of telegraph signalling.

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

Ellipsis of mental retardation.

Extreme stupidity.

That which retards; an obstacle; an obstruction.

Deceleration; reduction in the magnitude of velocity.

A suspension which resolves upwards.

Source: wiktionary.org