অর্থ : A decrease in rate of change.
উদাহরণ :
The deceleration of the arms race.
সমার্থক : deceleration, slowing
An increase in rate of change.
Modern science caused an acceleration of cultural change.অর্থ : The extent to which something is delayed or held back.
অর্থ : Lack of normal development of intellectual capacities.
সমার্থক : backwardness, mental retardation, slowness, subnormality
Retardation meaning in Bengali (Bangla).