(Noun) In extended use: a wealthy, influential, or powerful landowner or other person, especially one with an extravagantly luxurious lifestyle.

In Context

“Richard Croker retired after some years as Tammany leader in New York with $18,000,000 and is now living like a nabob on a beautiful estate just outside of Dublin, where he disgraces the United States flag by flying it night and day from his battlements.”

“Political Woodsawing,” Los Angeles Times, November 22, 1905.