A. Unless a contrary intention clearly appears, the following words and phrases shall have, for the purposes of this chapter, the meanings given in the following clauses.
B. For the purpose of this chapter, words and terms used herein shall be interpreted as follows:
(1) Words used in the present tense include the future.
(2) The singular includes the plural.
(3) The word lot includes the word "plot" or "parcel."
(4) The term "shall" is mandatory.
(5) The word "used" or "occupied," as applied to any land or building, shall be construed to include the words "intended, arranged or designed to be occupied."