REDUCTION Meaning of REDUCTION in English reduction BrE AmE ri ˈdʌk ʃ ə n rə- ▷ reduction|ism ˌɪz ə m▷ reduction|ist/s ɪst/s § əst/s AmE əst/s▷ reduction|s z Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012