My suggestion, as always is to try Lehmans Dictionary and Diagram Book. It has everything from really short definitions to super long legalese ones.
Here are ours, as massaged from Lehmans and other local by-laws.
YARD means the open, uncovered space on a lot appurtenant to a building and unoccupied by buildings or structures except as specifically permitted elsewhere in this By-law.
Yard, Front means a yard extending across the full width of a lot and between the front lot line and the nearest wall of any main building or structure on the lot.
Yard, minimum front means the minimum depth required by this By-law of a front yard on a lot between the front lot line and the nearest main wall of any building or structure on the lot.
Yard, Rear means a yard extending across the full width of a lot and between the rear lot line and nearest wall of any main building or structure on the lot.
Yard, minimum rear means the minimum depth required by this By-law of a rear yard on a lot between a rear lot line and the nearest main wall of any building or structure on the lot.
Yard, Side means a yard extending between the front yard and the rear yard and between a side lot line and the nearest main wall of any building or structure on the lot.
Yard, minimum side means the minimum depth required by this By-law of a side yard on a lot between a side yard line and the nearest main wall of any building or structure on the lot.