Davidson was announced as the newest member of the Atlantic 10 on Wednesday.
The Atlantic 10 Confeence Council of Presidents unanimously approved Davidson's application for membership.
"All of us in the Atlantic 10 are delighted to add such an academically distinguished and athletically competitive institution to our conference," said Steven Knapp, chair of the A-10 Council of Presidents and president of George Washington University.
Xavier and Butler defected to the new Big East prior to the 2013-14 season and after the upcoming season, Temple (American Athletic Conference) and Charlotte (Conference USA) are leaving the league.
Davidson joins George Mason as the A-10 newcomers. The Patriots are joining the A-10 for the 2013-14 season.
"The Atlantic 10 is a conference that gives Davidson the opportunity to be associated with and compete against institutions with significant profiles, both academically and athletically, while we continue to establish our national brand," Davidson athletic director Jim Murphy said. "This is a great opportunity to use athletics to further the goals and objectives of the college as we enhance the experience of our students."