For the purpose of this title, unless the context clearly requires otherwise:
(1) "Cannabis," "cannabis-infused products," and "useable cannabis" have the meanings provided in RCW
69.50.101;
(2) "Department" means the department of revenue of the state of Washington;
(3) "Director" means the director of the department of revenue of the state of Washington;
(4) "Taxpayer" includes any individual, group of individuals, corporation, or association liable for any tax or the collection of any tax hereunder, or who engages in any business or performs any act for which a tax is imposed by this title. "Taxpayer" also includes any person liable for any fee or other charge collected by the department under any provision of law, including registration assessments and delinquency fees imposed under RCW
59.30.050; and
(5) Words in the singular number include the plural and the plural include the singular. Words in one gender include all other genders.