As used in this chapter, the following terms shall have the meanings indicated:
Both the plural and the singular, and shall be construed to mean any individual, firm, member of a firm, partnership, member of a partnership, company or corporation or any officer, director or stockholder of such company or corporation or voluntary association or incorporated association. When construing and enforcing any provisions of this chapter, the act, omission or failure of any officer, agent or other person acting for or employed by any individual, association, company or corporation within the scope of his agency, employment or office shall in every case be deemed to be the act, omission or failure of such individual, association, company or corporation, as well as that of the person.