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Pronunciation:  `reetâr'deyshun

WordNet Dictionary
  1. [n]  the act of slowing down or falling behind
  2. [n]  a decrease in speed; "the deceleration of the arms race"
  3. [n]  lack of normal development of intellectual capacities
  4. [n]  any agent that retards or delays or hinders; "flame-retardant"
  5. [n]  the extent to which something is delayed or held back

RETARDATION is a 11 letter word that starts with R.


 Synonyms: backwardness, deceleration, lag, mental retardation, retardant, retardent, slowdown, slowing, slowness, subnormality
 Antonyms: acceleration
 See Also: abnormality, agent, amentia, delay, delay, Down syndrome, Down's syndrome, fastness, hold, holdup, idiocy, imbecility, mental defectiveness, mental deficiency, mongolianism, mongolism, moronity, postponement, speed, stupidity, swiftness, time lag, trisomy 21, wait



Webster's 1913 Dictionary
\Re`tar*da"tion\, n. [L. retardatio: cf. F.
1. The act of retarding; hindrance; the act of delaying; as,
   the retardation of the motion of a ship; -- opposed to

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

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

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

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}.
   (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.