Ohio Revised Code 2901.01(C) defines the term and many related terms:

(C) As used in Title XXIX [29] of the Revised Code:
(1) "School safety zone" consists of a school, school building, school premises, school activity, and school bus.
(2) "School," "school building," and "school premises" have the same meanings as in section 2925.01 of the Revised Code.
(3) "School activity" means any activity held under the auspices of a board of education of a city, local, exempted village, joint vocational, or cooperative education school district; a governing authority of a community school established under Chapter 3314. of the Revised Code; a governing board of an educational service center; or the governing body of a nonpublic school for which the state board of education prescribes minimum standards under section 3301.07 of the Revised Code.
(4) "School bus" has the same meaning as in section 4511.01 of the Revised Code.