retard - definition and synonyms

verb [transitive] formal 

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/rɪˈtɑː(r)d/
present tense
I/you/we/theyretard
he/she/itretards
present participleretarding
past tenseretarded
past participleretarded

derived word

retardation

 

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/ˌriːtɑː(r)ˈdeɪʃ(ə)n/
noun [uncountable]