- 1to make the development or progress of something slower synonym delay, slow down
- 2 The progression of the disease can be retarded by early surgery. The lack of a rail link retarded the town's development.
NAmE//rɪˈtɑrd//retard something(formal)Verb Forms present simple I / you / we / they retard
he / she / it retards
past simple retarded
-ing form retarding
retardationjump to other results
NAmE//ˌritɑrˈdeɪʃn//noun [uncountable] Many factors can lead to growth retardation in unborn babies.