As used in this part, unless the context otherwise requires:

(1) “Local government” means any county, municipality, city or other political subdivision of this state, including any school districts or school systems created thereby;
(2) “Private agency” means an accredited nonpublic school or a nonprofit institution of higher education eligible for tuition grants;
(3) “Public agency” means a state agency, local government, an institution under the control of the University of Tennessee or the Tennessee board of regents, the judicial department, the legislative department, a special school district or any other local public school system or school district created or authorized by the general assembly, a public library operated by any unit or agency of local or state government, a museum owned or operated by the state or any political subdivision of the state, or an agency or instrumentality of the federal government; and
(4) “State communications” refers to the transmission of voice, data, video, the written word or other visual signals by electronic means but does not include broadcast radio and television facilities.