Billionaire (noun)

1. A person who has a net worth of a billion dollars or more.
2. A very wealthy person with an enormous amount of money.

Origin:

The word billionaire comes from the combination of the word billion, which means a thousand million, and the suffix -aire, which means having a certain quality or condition, so billionaire means a person who has a net worth of a billion dollars or more.

Examples:

1. He became a billionaire after his company went public.
2. The billionaire donated a large sum of money to the charity.
3. There are several billionaires in the world.
4. The billionaire's yacht was one of the largest in the harbor.
5. The billionaire"s lifestyle is vastly different from the average person"s.