UNBILLED REVENUE is revenue which had been recognized but which had not been billed to the purchaser(s).
PERTURBATION CONTROL is a restriction control to limit the access a particular user has to details in a database. It introduces noise into the output (perturbs, or changes it) to shield the specifics of one record from the person who has only access to summary information.
BUDGET DEFICIT is usually the difference between government spending and revenue and thus the amount that needs to be borrowed. Definition varies between countries.
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