Noun
The act of retarding; hindrance; the act of delaying; as, the retardation of the motion of a ship; -- opposed to acceleration.
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 extent to which anything is retarded; the amount of retarding or delay.
Source: Webster's dictionarythe deceleration of the arms race Source: Internet
flame-retardant Source: Internet
And even now, advocates for patients with disabilitiesthe guidance provided in some states, are unfair to people with severe mental retardation or those in a persistent vegetative state. Source: Internet
Before his death, however, the retardation of light in denser media was demonstrated by the experiments of H. L. Fizeau and B. L. Foucault, which, with improvements in detail, were based on the plan proposed by him. Source: Internet
A part of the answer was suggested independently in the 1860s by Delaunay and by William Ferrel : tidal retardation of Earth's rotation rate was lengthening the unit of time and causing a lunar acceleration that was only apparent. Source: Internet
Extracting the spectrum The intensity as a function of the path length difference (also denoted as retardation) in the interferometer and wavenumber is Peter Atkins, Julio De Paula. 2006. Source: Internet