It is the intent of this chapter to confer upon the Zoning Board of Adjustment as full and complete powers as may lawfully be conferred upon such Board, including, but not limited to the authority, in connection with any case or proceeding before the Board, to interpret and construe the provisions, including any word, term, clause or sentence, of this chapter, the zoning regulations and the Zoning Map in accordance with the general rules of construction applicable to legislative enactments.