Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun retardation

5 senses of retardation

Sense 1
deceleration, slowing, retardation -- (a decrease in rate of change; "the deceleration of the arms race")
       => change, alteration, modification -- (an event that occurs when something passes from one state or phase to another; "the change was intended to increase sales"; "this storm is certainly a change for the worse"; "the neighborhood had undergone few modifications since his last visit years ago")

Sense 2
retardation -- (the extent to which something is delayed or held back)
       => delay, hold, time lag, postponement, wait -- (time during which some action is awaited; "instant replay caused too long a delay"; "he ordered a hold in the action")

Sense 3
retardant, retardent, retardation -- (any agent that retards or delays or hinders; "flame-retardant")
       => agent -- (an active and efficient cause; capable of producing a certain effect; "their research uncovered new disease agents")

Sense 4
retardation, mental retardation, backwardness, slowness, subnormality -- (lack of normal development of intellectual capacities)
       => stupidity -- (a poor ability to understand or to profit from experience)

Sense 5
slowdown, lag, retardation -- (the act of slowing down or falling behind)
       => delay, holdup -- (the act of delaying; inactivity resulting in something being put off until a later time)