billionth
/ˈbɪljənθ/
noun
- One of one billion equal parts of something.
- Only a billionth of the light reaches the Earth from that star.
- The scale can measure a billionth of a gram.
- A nanosecond is one billionth of a second.
adjective
- Coming after the 999,999,999th in order; last in a series of one billion.
- She was the billionth customer to enter the store and won a prize.
- The company celebrated its billionth product sold.
- He received a medal for being the billionth visitor to the park.