For the purpose of WAC 180-16-162, the term "strike" shall mean: A concerted work stoppage by employees of a school district of which there has been a formal declaration by their recognized representative and notice thereof provided to the district by such representative at least two calendar school days in advance of the actual stoppage.
Wash. Admin. Code § 180-16-163
Order 5-73, § 180-16-163, filed 9/6/73.