"Class" means a setting in which organized instruction of academic course content is regularly provided to a group of students for a given scheduled period of time.
"Class instructor" means a teacher who has been assigned to teach students in a class at a public school.
"Class section" means a single class where a class instructor is assigned to teach more than one class per school day.
"Class size" means the number of students in a class who appear on the class roster and for whom the class instructor is primarily responsible and accountable.
"Pupil-teacher ratio" means the total number of students in a school divided by the total number of teachers working in that school.
"Teacher" means an individual instructing students at a public school.
105 ILCS 5/2-3.136a