1. 延迟;减缓;落后;迟缓
Retardation is the process of making something happen or develop more slowly, or the fact of being less well developed than other people or things of the same kind.
1. the act of slowing down or falling behind
2. a decrease in rate of change
e.g. the deceleration of the arms race
Synonym: decelerationslowing
3. lack of normal development of intellectual capacities
Synonym: mental retardationbackwardnessslownesssubnormality
4. any agent that retards or delays or hinders
e.g. flame-retardant
Synonym: retardantretardent
5. the extent to which something is delayed or held back