the state of needing something that is absent or unavailable; "there is a serious lack of insight into the problem"; "water is the critical deficiency in desert regions"; "for want of a nail the shoe was lost"
be without; "This soup lacks salt"; "There is something missing in my jewelry box!"
an insufficient quantity or number
an acute insufficiency
the property of being an amount by which something is less than expected or required; "new blood vessels bud out from the already dilated vascular bed to make up the nutritional deficit"