10. Grade 9 to 12 portion. "Grade 9 to 12 portion" means those pupils in the secondary grades or high school level.

11. Guidance staff. "Guidance staff" means full-time equivalent public guidance counselors, directors of guidance or school social workers, as documented in the department's database.

12. Health staff. "Health staff" means full-time equivalent public school nurses, as documented in the department's database.

13. High school level. "High school level" means grade 9 to grade 12.

13-A.__Institutional resident.__"Institutional resident" means a person between 5 years of age and 20 years of age who is attending a public school of the school administrative unit and who is committed or otherwise legally admitted to and residing at a state-operated institution.__"Institutional resident" does not include students attending private facilities, regardless of the means of placement.

14. Income weight. "Income weight" means a value between zero and one that is used to adjust a municipality's ratio of local median household income to the statewide median household income. The income weight plus the property weight, as defined in subsection 24, must total one.

15. Kindergarten to grade 8 portion. "Kindergarten to grade 8 portion" means those pupils in the elementary grades or a combination of the elementary school level and middle school level.

16. Kindergarten to grade 2 student. "Kindergarten to grade 2 student" means a student in any grade from prekindergarten to grade 2 who is at least 5 4 years old on October 15th of the school year.

17. Librarian. "Librarian" means a full-time equivalent public librarian or media specialist, as documented in the department's database.

18. Limited English proficiency student. "Limited English proficiency student" means a student who was not born in the United States or whose native language is a language other than English and who satisfies the definition of a limited English