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The Collaborative International Dictionary
Retardation

Retardation \Re`tar*da"tion\, n. [L. retardatio: cf. F. retardation.]

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

    The retardations of our fluent motion.
    --De Quinsey.

  2. That which retards; an obstacle; an obstruction.

    Hills, sloughs, and other terrestrial retardations.
    --Sir W. Scott.

  3. (Mus.) 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.

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

    1. The lunitidal interval, or the hour angle of the moon at the time of high tide any port; the interval between the transit of the moon and the time of high tide next following.

    2. The age of the tide; the retard of the tide. See under Retard, n.

Douglas Harper's Etymology Dictionary
retardation

early 15c., "fact or action of making slower in movement or time," from Latin retardationem (nominative retardatio) "a delaying," noun of action from past participle stem of retardare "to make slow, delay, keep back, hinder," from re- (see re-), + tardare "to slow," related to tardus "slow, sluggish" (see tardy). Sense of "educational slowness" is from 1907.

Wiktionary
retardation

n. 1 The act of retarding or delaying; hindrance. 2 The extent to which anything is retarded; the result of any retarding or delay; mental, social, or physical slowness. 3 That which retards; an obstacle; an obstruction. 4 (context physics English) deceleration; reduction in the magnitude of velocity. 5 (context music English) A suspension which resolves upwards.

WordNet
retardation
  1. n. a decrease in speed; "the deceleration of the arms race" [syn: deceleration, slowing] [ant: acceleration]

  2. the extent to which something is delayed or held back

  3. any agent that retards or delays or hinders; "flame-retardant" [syn: retardant, retardent]

  4. lack of normal development of intellectual capacities [syn: mental retardation, backwardness, slowness, subnormality]

  5. the act of slowing down or falling behind [syn: slowdown, lag]

Wikipedia
Retardation

Retardation is the act or result of delaying; the extent to which anything is retarded or delayed; that which retards or delays.

Retardation or retarded may refer to:

Usage examples of "retardation".

Retardation of coronary arteriosclerosis with yoga lifestyle intervention.

All humans had repeat sequences, the presence of which were associated with various diseases: spinal and bulbar muscular atrophy, fragile X mental retardation, myotonic dystrophy, Huntington disease, spinocerebrellar ataxia, dentatorubral-pallidoluysian atrophy, and Machado-Joseph disease.

Stevens is a twenty-two-year-old muscular Caucasian male institutionalized since age four with undiagnosed mental retardation, who is admitted for definitive work-up and repair of his congenital cardiac abnormality thought to be a septal defect .

The committee charged with carrying out the program issued instructions to all Reich health agencies to register children born with congenital deformities, including idiocy, Mongolism, microcephaly, hydrocephaly, missing limbs, malformation of the head, spina bifida, muscular dystrophy, mental retardation, and other congenital diseases.

Whilst we may not describe this retardation, as is usually done, in terms of a smaller velocity of light itself within the denser medium, we may rightly say that density has the effect of lessening the intensity of the light.

Why did he gift them with these deformities, why not merely with old-fashioned spina bifida or muscular dystrophy or retardation or fetal alcohol syndrome?

Secondly, if the light is only somewhat dimmed, by the acceleration and increase of the movement towards it, and by the retardation or arrestment of that from the light, some lateral movement being still retained, for the light will interfere less with a movement at right angles to its direction, than with one in its own direction.

All humans had repeat sequences, the presence of which were associated with various diseases: spinal and bulbar muscular atrophy, fragile X mental retardation, myotonic dystrophy, Huntington disease, spinocerebrellar ataxia, dentatorubral-pallidoluysian atrophy, and Machado-Joseph disease.

To make use of these retardations or reversals of time, therefore, one had to enter them physically.

The rate of selfconsumption would be greatly increased if the flight profile proved to be irregular, involving retardations which took the ship below the critical .