retardation

Noun

• the act of slowing down or falling behind

• lack of normal development of intellectual capacities

• any agent that retards or delays or hinders
  • flame-retardant
    

• the extent to which something is delayed or held back

• a decrease in rate of change
  • the deceleration of the arms race
    

Related words

• Synonyms: 
  slowdown , lag , mental retardation , backwardness , slowness , subnormality , retardant , retardent , deceleration , slowing