ACCESSORY BUILDING - A building customarily incidental to a principal building on the same lot or on an adjoining lot under the same ownership, and not attached to the principal building by any covered or roofed structure.
ACCESSORY USE - The use of a building or premises which is customarily incidental to a principal permitted use.
AGRICULTURAL USE, EXEMPT - Agriculture, horticulture, silviculture, aquaculture, or viticulture exempted by M.G.L. c. 40A, s. 3.
AGRICULTURAL USE, NONEXEMPT - Agricultural use of property not exempted by M.G.L. c. 40A, s. 3.
ALTERATION - A change in or addition to a building or structure.