- lack, deficiency, want - 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"
--1 is a kind of need, demand
--1 has particulars:absence; dearth, famine, shortage; mineral deficiency; stringency, tightness Derived form: verb lack1