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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.
physical energy or intensity; "he hit with all the force he could muster"; "it was destroyed by the strength of the gale"; "a government has not the vitality and forcefulness of a living man"
n.
an event that fails badly or is totally ineffectual; "the first experiment was a real turkey"; "the meeting was a dud as far as new business was concerned"
n.
inability to discharge all your debts as they come due; "the company had to declare bankruptcy"; "fraudulent loans led to the failure of many banks"
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