55 ILCS 5/2-1005
A majority of the members of any county board shall constitute a quorum for the transaction of business; and all questions, ordinances, resolutions, or motions which shall arise at meetings shall be determined by the votes of the majority of the members present, except in such cases as is otherwise provided.
A county board in a county where the chairman is elected at large may upon passage, adoption or enactment of a specific ordinance, resolution, or motion apply the following provisions: Any ordinance, resolution, or motion passed, adopted or otherwise enacted by the board in a county where the chairman is elected at large shall be presented to the chairman before it becomes effective. If the chairman approves such ordinance, resolution or motion, he shall sign it and it shall become law on the date prescribed; if not, he shall return it to the board within 10 business days with his objections and the board shall proceed to reconsider the matter at its next meeting, to be held within 30 business days of the board's receipt of the chairman's objections. If after such reconsideration a majority of the members of the board pass such ordinance, resolution, or motion, it shall become effective on the date prescribed but not earlier than the date of passage following reconsideration. If any ordinance, resolution, or motion is not returned by the chairman to the board within 10 business days after it has been presented to him, it shall become effective at the end of the 10th day.
The county board at any properly noticed public meeting may by unanimous consent take a single vote by yeas and nays on the several questions of the passage of any 2 or more of the designated ordinances, orders, resolutions, or motions placed together for voting purposes in a single group. The single vote shall be entered separately in the minutes under the designation "omnibus vote", and in that event the clerk may enter the words "omnibus vote" or "consent agenda" in the minutes in each case instead of entering the names of the members of the county board voting "yea" and those voting "nay" on the passage of each of the designated ordinances, orders, resolutions, and motions included in the omnibus group or consent agenda. The taking of a single or omnibus vote and the entries of the words "omnibus vote" or "consent agenda" in the minutes shall be a sufficient compliance with the requirements of this Section to all intents and purposes and with like effect as if the vote in each case had been taken separately by yeas and nays on the question of the passage of each ordinance, order, resolution, and motion included in the omnibus group and separately recorded in the minutes. Likewise, the yeas and nays shall be taken upon the question of the passage of any other ordinance, resolution, or motion at the request of any county board member and shall be recorded in the minutes. The changes to this Section made by this amendatory Act of the 99th General Assembly are declarative of existing law and do not change the substantive operation of this Section.
55 ILCS 5/2-1005