billionaire

noun

bil·​lion·​aire ˌbi(l)-yə-ˈner 

ˈbi(l)-yə-ˌner

: 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

The largest donation to Philander Smith came in the door in November to the tune of $19 million, from billionaire MacKenzie Scott. —Arkansas Online, 23 Mar. 2026

The private orbital mission will bring billionaire Jared Isaacman to space for a second time after 2021′s Inspiration4 mission. —Richard Tribou, The Orlando Sentinel, 22 Mar. 2026

One local billionaire who has donated tens of millions of dollars to Aztecs athletics is a non-SDSU alum, John Moores, a University of Houston graduate. —Tom Krasovic, San Diego Union-Tribune, 22 Mar. 2026

Backers warn that without the billionaire tax, dozens of hospitals and emergency departments could also be forced to close. —Ben Paviour, Sacbee.com, 21 Mar. 2026

Word History

Etymology

billion + -aire (as in millionaire)

First Known Use

1841, in the meaning defined above

Rhymes for billionaire

• aftercare
• anywhere
• chinaware
• debonair
• dinnerware
• disrepair
• doctrinaire
• earthenware
• everywhere
• frigidaire
• kitchenware
• legionnaire

Kids Definition

billionaire

noun

bil·​lion·​aire ˌbil-yə-ˈna(ə)r 

-ˈne(ə)r;

ˈbil-yə-ˌna(ə)r, 

-ˌne(ə)r

: one whose wealth is a billion dollars or more