retardation
英 [,ri?tɑ?'de???n]
美[,ritɑr'de??n]
英英釋意
- 1. a decrease in speed;
- "the deceleration of the arms race"
- 2. the extent to which something is delayed or held back
- 3. any agent that retards or delays or hinders;
- "flame-retardant"
- 4. lack of normal development of intellectual capacities
- 5. the act of slowing down or falling behind