retardation has definitions from the field of psychology
1
[ noun ] a decrease in speed

Examples

"the deceleration of the arms race"

Used in print

(J. F. Vedder, "Micrometeorites", in Francis S. J...)

The Poynting-Robertson effect ( Robertson , 1937 ; Wyatt and Whipple , 1950 ) , which is a retardation of the orbital motion of particles by the relativistic aberration of the repulsive_force of the impinging solar_radiation , causes the dust to spiral into the sun in times much shorter than the age of the Earth .

2
[ noun ] any agent that retards or delays or hinders

Synonyms

retardent retardant

Examples

"flame-retardant"

Related terms

agent retard

3
[ noun ] (psychology) lack of normal development of intellectual capacities
4
[ noun ] the extent to which something is delayed or held back

Related terms

delay retard

5
[ noun ] the act of slowing down or falling behind

Synonyms

lag slowdown

*