As used in this chapter, the following terms shall have the meanings indicated:
NONCONFORMING STRUCTURE OR LOT
A structure or lot that does not conform to a dimensional regulation prescribed by this chapter for the district in which it is located or to regulations for signs, off-street parking, off-street loading or accessory buildings, but which structure or lot was in existence at the effective date of this chapter and was lawful at the time it was established.
NONCONFORMING USE
A use of a building or lot that does not conform to a use regulation prescribed by this chapter for the district in which it is located, but which was in existence at the effective date of this chapter and was lawful at the time it was established.