The following words or terms, when used in this Subchapter, shall have the following meaning, unless the concept clearly indicates otherwise:
"Higher education" "...include[s] all education of any kind beyond or in addition to the twelfth grade or its equivalent as that grade is now generally understood and accepted in the public schools of the State of Oklahoma..." [70 O.S., §3102(d)];"... provided, however, that this shall not exclude as a constituent institution any institution of higher learning which now offers as a part of its curriculum courses of high school study.
Okla. Admin. Code § 610:1-1-2