Ariz. Admin. Code § 18-13-2101
In addition to the definitions in A.R.S. §§ 49-701 and 49-701.01, for the purpose of this Article, the terms used in this Article have the following meanings:
1. "Defined time period" means the 12-month period that begins on July 1 of a calendar year and ends on June 30 of the following calendar year and consists of the actual number of calendar days in that 12-month period.
2. "Disposal fee invoice" means the quarterly landfill disposal fee invoice the Department mails to a landfill operator, on which the landfill operator indicates the amount of waste received and the amount of the disposal fees owed to the Department as required under A.R.S. § 49-836.
3. "Full quarter" means any of the standard fiscal quarters of the defined time period for which a municipal solid waste landfill accepted waste on or before the first day of the quarter and on or after the last day of that quarter.
Ariz. Admin. Code § R18-13-2101