census n: a usually complete count of a population (as of a state)
: a periodic governmental count of a population that usually includes social and economic information (as occupations, ages, and incomes) see also Article I and Amendment XVI of the Constitution in the back matter
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.