"Enlargement of a use" means the expansion of or addition to a use by increasing the amount of land or building area which is devoted to the use.

"Enlargement of structure" means any action which increases the exterior dimensions of a structure.

"Intensification" means any action which results in an increase in the level of use or activity within a defined structure or area.

"Nonconforming" means any use, structure or parcel of land existing prior to the effective date of this code and does not conform to one or more of the regulations applicable to the district it is located.