de·fi·cien·cy 
/dɪˈfɪʃənsi/ noun
plural de·fi·cien·cies /dɪˈfɪʃənsi/ noun 1 : a lack of something that is needed : the state of not having enough of something necessary [count] ▪ The disease may be caused by nutritional deficiencies. ▪ The book's major deficiency is its poor plot. ▪ a deficiency of vitamin C [noncount] ▪ vitamin deficiency 2 [count] : a problem in the way something is made or formed
▪ There are several deficiencies in his plan. ▪ The accident was caused by deficiencies in the engine.
▪ There are several deficiencies in his plan. ▪ The accident was caused by deficiencies in the engine.
