The Terrapins were a charter member of the ACC, which was founded in 1953.
"Our best wishes are extended to all of the people associated with the University of Maryland," ACC Commissioner John Swofford said in a statement. "Since our inception, they have been an outstanding member of our conference and we are sorry to see them exit. For the past 60 years the Atlantic Coast Conference has exhibited leadership in academics and athletics. This is our foundation and we look forward to building on it as we move forward."
There was speculation last week the Big Ten and Maryland were talking. On Saturday, it became clear the discussions were serious.
"Space is not the divide that it was once upon a time," Delany said.
Maryland also gives the Big Ten a presence in the major media market of Washington. D.C.