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3 definitions found
 for Retardation
From The Collaborative International Dictionary of English v.0.48 :

  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.
        [1913 Webster]
  
              The retardations of our fluent motion. --De Quinsey.
        [1913 Webster]
  
     2. That which retards; an obstacle; an obstruction.
        [1913 Webster]
  
              Hills, sloughs, and other terrestrial retardations.
                                                    --Sir W.
                                                    Scott.
        [1913 Webster]
  
     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.
        [1913 Webster]
  
     4. The extent to which anything is retarded; the amount of
        retarding or delay.
        [1913 Webster]
  
     Retardation of the tide.
        (a) 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.
        (b) The age of the tide; the retard of the tide. See under
            Retard, n.
            [1913 Webster]

From WordNet (r) 3.0 (2006) :

  retardation
      n 1: a decrease in rate of change; "the deceleration of the arms
           race" [syn: deceleration, slowing, retardation] [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, retardation]
      4: lack of normal development of intellectual capacities [syn:
         retardation, mental retardation, backwardness,
         slowness, subnormality]
      5: the act of slowing down or falling behind [syn: slowdown,
         lag, retardation]

From Moby Thesaurus II by Grady Ward, 1.0 :

  136 Moby Thesaurus words for "retardation":
     afterthought, amentia, arrest, arrestation, arrested development,
     arrestment, backwardness, bind, blithering idiocy, block, blockage,
     blocking, bureaucratic delay, check, clogging, closing up, closure,
     constraint, constriction, control, cooling, cooling down,
     cooling off, cramp, cretinism, curb, curtailment, deceleration,
     delay, delayage, delayed reaction, detainment, drag, dragging,
     ease-off, ease-up, fixation, flagging, foot-dragging,
     half-wittedness, halt, hampering, hang-up, hindering, hindrance,
     holdback, holdup, idiocy, idiotism, imbecility, impediment,
     infantilism, inhibition, injunction, insanity, interdict,
     interference, interim, interruption, jam, lag, lagging,
     legal restraint, let, letdown, letup, logjam, mental defectiveness,
     mental deficiency, mental handicap, mental retardation,
     minus acceleration, mongolianism, mongolism, mongoloid idiocy,
     monopoly, moratorium, moronism, moronity, negativism,
     nuisance value, obstruction, obstructionism, occlusion, opposition,
     paperasserie, pause, profound idiocy, prohibition, protection,
     protectionism, protective tariff, rationing, red tape, red-tapeism,
     red-tapery, rein, repression, reprieve, resistance, respite,
     restraint, restraint of trade, restriction, retardance, retardment,
     retrenchment, self-control, setback, simple-wittedness,
     simplemindedness, simpleness, simplicity, slack-up, slackening,
     slow-up, slowdown, slowing, slowing down, slowness, slowup,
     squeeze, stay, stay of execution, stop, stoppage, stranglehold,
     stricture, subnormality, suppression, suspension, tariff wall,
     thought control, tie-up, time lag, wait
  
  

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