Definition of "billionaire" []

• A person whose wealth amounts to at least a billion dollars, pounds, or the equivalent in other currency. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The world's youngest billionaire is now 26-year-old Dustin Moskovitz, who is 8 days younger than his former Harvard roommate and Facebook cofounder Mark Zuckerberg."
• "SAGAL: So our question is, Mayor Bloomberg, you are aware you are a billionaire, is this not true?"
• "That's where the oil company that made Adams a billionaire is based."