retardation

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English[edit]

Etymology[edit]

retard +‎ -ation

Noun[edit]

retardation (countable and uncountable, plural retardations)

  1. The act of retarding or delaying; hindrance.
    1. (acoustics) The distance by which one wave is behind another.
    2. (music) The act of diminishing the rate of speed.
    3. (telegraphy) A decrease in the speed of telegraph signalling.
  2. The extent to which anything is retarded; the result of any retarding or delay; mental, social, or physical slowness.
  3. (colloquial, derogatory, offensive) Extreme stupidity.
  4. That which retards; an obstacle; an obstruction.
  5. (physics) Deceleration; reduction in the magnitude of velocity.
    • 1960 April, “The braking of trains”, in Trains Illustrated, page 237:
      [...] the effect is automatically to select a braking force which is higher at above 40 m.p.h., in the initial stages of retardation, but is reduced as the speed falls below 40 m.p.h.
  6. (music) A suspension which resolves upwards.

Related terms[edit]

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