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zoning ordinance. A city ordinance that regulates the use to which land within various parts of the city may be put. • It allocates uses to the various districts of a municipality, as by allocating residences to certain parts and busi-nesses to other parts. A comprehensive zoning ordinance usu. regulates the height of buildings and the proportion of the lot area that must be kept free from buildings. [Cases: Zoning and Planning 4, 21. C.J.S. Zoning and Land Planning §§ 3, 5–7, 10, 18–19, 37, 85.]