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n.
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"
n.
a freedom from financial difficulty that promotes a comfortable state; "a life of luxury and ease"; "he had all the material comforts of this world"
n.
(chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million