- the act of slowing down or falling behind
Synonym: slowdownlag
- a decrease in rate of change
- the deceleration of the arms race
Synonym: decelerationslowing
- lack of normal development of intellectual capacities
Synonym: mental retardationbackwardnessslownesssubnormality
- any agent that retards or delays or hinders
- flame-retardant
Synonym: retardantretardent
- the extent to which something is delayed or held back