For the purpose of this Zoning Ordinance certain terms and words are defined as follows: Words used in the present tense include the future, and the plural includes the singular, and the singular the plural. The word "shall" is intended to be mandatory; "occupied" or "used" shall be considered as though followed by the words "or intended, arranged or designed to be used or occupied". Except where specifically defined, all words in this Zoning Ordinance shall carry their customary meanings.