1. In this Regulation, “accessory”, when used to describe a use, building or structure, means a use, building or structure normally incidental or subordinate to the principal use, building or structure located on the same lot; “agricultural use” includes a use of land, buildings or structures for the purpose of forestry, field crops, fruit farming, market gardening, dairying, animal husbandry, poultry or beekeeping; “dwelling” means one or more habitable rooms designed for use by and occupied by not more than one household and in which separate kitchen and sanitary facilities are provided for the exclusive use of the household, with a private entrance from outside the building or from a common hallway or stairway inside the building; “floor area” means the total area of all floors contained within the outside walls of a building, excluding in the case of a single dwelling, the floor area of a private garage, porch, verandah, unfinished attic, basement or cellar; “frontage” means the width of a lot measured along a line twenty-five feet back from the street and parallel to the lot line abutting the street; “front yard” means a yard extending across the full width of a lot on which a building is situate, and extending from the front lot line to the main wall of the building for which such front yard is required that is nearest to the front lot line; “home occupation” means any occupation for gain or support conducted entirely within a single or semi-detached dwelling by one or more member of the household residing in the dwelling, provided that, (a)  there is no external display or advertising other than a sign having a total display area not exceeding two square feet. (b)  there is no external storage of goods or materials, and not more than 25 per cent of the total floor area is used for the home occupation use, and (c)  there are no persons employed in the dwelling except, (i)  the members of the household residing in the dwelling, or (ii)  in the case of a dentist, physician or veterinarian, a staff of one person; “household” means one or more persons living as a single housekeeping unit in one dwelling; “lot” means a parcel of land, described in a deed or other document legally capable of conveying title to or interest in land, or shown as a lot or block on a registered plan of subdivision; “lot area” means the total horizontal area within the lot lines of a lot; “rear yard” means a yard extending across the full width of a lot on which a building is situate, and extending from the rear lot line to the main wall of the building for which such rear yard is required that is nearest to the rear lot line; “side yard” means a yard extending from the front yard to the rear yard and from the side lot line to the main wall of the building for which such side yard is required that is nearest to the side lot line; “single dwelling” means a separate building containing only one dwelling; “street” means a public highway that is a principal means of access to abutting lots, that is under the jurisdiction of the Province of Ontario or the Regional Municipality of York or the Town of Markham, or is a road within a registered plan of subdivision, or is a road the maintenance of which has been assumed by the town; “yard” means a space open from the ground to the sky on a lot on which a building is situate which space is unoccupied except for such accessory buildings as are permitted in this regulation. O. Reg. 473/73, s. 1; O. Reg. 700/91, ss. 1, 2. Application