The process by which legislative seats are distributed among units entitled to representation; determination of the number of representatives that a state, county, or other subdivision may send to a legislative body. The U.S. Constitution provides for a census every ten years, on the basis of which Congress apportions representatives according to population; each state, however, must have at least one representative. Districting is the establishment of the precise geographical boundaries of each such unit or constituency. Apportionment by state statute that denies the rule of ONE-PERSON, ONE-VOTE is violative of EQUAL PROTECTION OF LAWS.

Also, the allocation of a charge or cost such as real estate taxes between two parties, often in the same ratio as the respective times that the parties are in possession or ownership of property during the fiscal period for which the charge is made or assessed.

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