Ohio Const. art. II, § 16

If the governor approves an act, he shall sign it, it becomes law and he shall file it with the secretary of state.

If he does not approve it, he shall return it with his objections in writing, to the house in which it originated, which shall enter the objections at large upon its journal, and may then reconsider the vote on its passage. If three-fifths of the members elected to the house of origin vote to repass the bill, it shall be sent, with the objections of the governor, to the other house, which may also reconsider the vote on its passage. If three-fifths of the members elected to the second house vote to repass it, it becomes law notwithstanding the objections of the governor, and the presiding officer of the second house shall file it with the secretary of state. In no case shall a bill be repassed by a smaller vote than is required by the constitution on its original passage. In all cases of reconsideration the vote of each house shall be determined by yeas and nays, and the names of the members voting for and against the bill shall be entered upon the journal.

If a bill is not returned by the governor within ten days, Sundays excepted, after being presented to him, it becomes law in like manner as if he had signed it, unless the general assembly by adjournment prevents its return; in which case, it becomes law unless, within ten days after such adjournment, it is filed by him, with his objections in writing, in the office of the secretary of state. The governor shall file with the secretary of state every bill not returned by him to the house of origin that becomes law without his signature.

The governor may disapprove any item or items in any bill making an appropriation of money and the item or items, so disapproved, shall be void, unless repassed in the manner prescribed by this section for the repassage of a bill.