As used in this act:

(a) “Juvenile” means a person who is less than 18 years of age;

(b) “adult” means a person who is 18 years of age or older;

(c) “felony” means any crime designated a felony by the laws of Kansas or the United States;

(d) “misdemeanor” means any crime designated a misdemeanor by the laws of Kansas or the United States;

(e) “school day” means any day on which school is maintained;

(f) “school year” means the same as such term is defined in Kan. Stat. Ann. § 72-5132, and amendments thereto;

(g) “counsel” means any person a pupil selects to represent and advise the pupil at all proceedings conducted pursuant to the provisions of this act; and

(h) “principal witness” means any witness whose testimony is of major importance in support of the charges upon which a proposed suspension or expulsion from school is based, or in determination of material questions of fact.