The word "deficiency" in English means: A lack or shortage of something necessary., A fault or weakness., The state of not having enough of something important..
The phonetic transcription of "deficiency" is /dɪˈfɪʃ(ə)nsi/ in British English and /dɪˈfɪʃənsi/ in American English. Click the 🔊 button to hear both pronunciations.