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retardation
/ˌriːˌtɑɚˈdeɪʃən/
US
UK
noun
[noncount] old-fashioned + sometimes offensive :an unusual slowness of mental development
The
child
suffered
severe
mental
retardation.
formal :an act of slowing down the development or progress of something
The
chemical
induced
a
retardation
of
cell
growth
.
US