DIAGNOSTIC Meaning of DIAGNOSTIC in English diagnostic BrE AmE ˌda ɪ ‿əɡ ˈnɒst ɪk ◂ AmE \ -ˈnɑːst-▷ diagnostic|ally ə l‿i▷ diagnostic|s s Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012