Oxford Advanced American Dictionary

Definition of lack verb from the Oxford Advanced Learner's Dictionary

 Oxford3000

lack

verb
lack pronunciation English læk lack pronunciation American læk
 
[no passive] lack something to have none or not enough of somethingSome houses still lack basic amenities such as bathrooms.He lacks confidence.She has the determination that her brother lacks. see also lacking
Idioms

lack (for) nothing

(formal) to have everything that you needAs the only child of wealthy parents, he lacked for nothing.
 more at have/lack the courage of your convictions at courage