The act of retarding; hindrance; the act of delaying; as, the retardation of the motion of a ship; -- opposed to acceleration.

The extent to which anything is retarded; the amount of retarding or delay.

Delay or halt of any process such as mental or physical development.

The operation of reducing the elevator drive motor speed from normal operating speed to stop. Also referred to as Deceleration.

a decrease in speed; "the deceleration of the arms race"

a process of slowing down the movement of contaminants through natural or engineered processes.

Preferential retention of contaminant movement in the subsurface resulting from adsorptive processes or solubility differences. saturated zone: the zone in which all the voids in the rock or soil are filled with water at greater than atmospheric pressure. The water table is the top of the saturated zone in an unconfined aquifer.

the act of slowing down or falling behind

(See "Reevaluation.")

The actual distance of one of the doubly refracted rays behind the other as they emerge from an anisotropic particle. It depends on the different in the two refractive indices, n2 - n1, and the thickness.

That which retards; an obstacle; an obstruction.

The keeping back of an approaching consonant chord by prolonging one or more tones of a previous chord into the intermediate chord which follows; -- differing from suspension by resolving upwards instead of downwards.

The amount of time by which corresponding tidal phases grow later day by day (about 50 minutes).

the reduction in phase velocity while propagating in a medium.

lack of normal development of intellectual capacities

Difficulty with the capacity to learn. No definite brain damage is indicated in the history or from neurological findings; nor is there any evidence/suggestion of other cause(s).