billionaire

noun

bil·​lion·​aire ˌbi(l)-yə-ˈner How to pronounce billionaire (audio)
ˈbi(l)-yə-ˌner
Synonyms of billionairenext
: one whose wealth is estimated at a billion or more dollars, pounds, or other monetary units

Examples of billionaire in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The October poll found just 46% of likely voters would vote yes on Proposition 40, the billionaire’s tax, while 52% would vote no. — Andrew Graham october 27, Sacbee.com, 28 Oct. 2026 And most of us are tired of paying for the playthings of millionaires and billionaires. — Chicago Tribune, 28 Oct. 2026 His single biggest donation is $1 million from hedge fund billionaire Ken Griffin. — Jeffrey Schweers, The Orlando Sentinel, 28 Oct. 2026 Given how many venal tech billionaires have grabbed our attention over the last several years, you’d be forgiven for having only a hazy memory of Sam Bankman-Fried. — Joy Press, Vanity Fair, 28 Oct. 2026 See All Example Sentences for billionaire

Word History

Etymology

billion + -aire (as in millionaire)

First Known Use

1841, in the meaning defined above

Time Traveler
The first known use of billionaire was in 1841

Rhymes for billionaire

See All Rhymes for billionaire

Browse Nearby Words

billion
billionaire
billionairess
See all Nearby Words

Cite this Entry

“Billionaire.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/billionaire. Accessed 1 Nov. 2026.

Copy Citation

Kids Definition

billionaire

noun
bil·​lion·​aire ˌbil-yə-ˈna(ə)r How to pronounce billionaire (audio)
-ˈne(ə)r;
ˈbil-yə-ˌna(ə)r, 
-ˌne(ə)r
: one whose wealth is a billion dollars or more

More from Merriam-Webster on billionaire

Thesaurus: All synonyms and antonyms for billionaire

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Last Updated: - Updated example sentences

More from Merriam-Webster

Word of the Day

Listen to the pronunciation of Pyrrhic

See Definitions and Examples »

Popular in Grammar & Usage

See More

How to Use 'Who' vs. 'Whom'

Merriam-Webster’s Great Big List of Words You Love to Hate

'Affect' vs. 'Effect'

'A' or 'an'? What about before 'h'? An Indefinite Article Guide

Why is '-ed' sometimes pronounced at the end of a word?
See More

Popular in Wordplay

See More

The Longest Long Words List

9 Words That Sound Like Insults But Aren't

Pwn, Skibidi, Girlboss and Other Words Added to the 2026 Scrabble Dictionary

The Words of the Week - Oct. 30

12 Lovely and Unusual Words for the Natural World
See More

Popular

See More

How to Use 'Who' vs. 'Whom'

The Longest Long Words List

9 Words That Sound Like Insults But Aren't
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
couple-laugh-cafe
Quiz: Foreign Phrases You Should Know Check out your bona fides and avoid any faux pas.
See All