one billionth
/wʌn ˈbɪljənθ/
noun
- One part out of one billion equal parts of something; 1/1,000,000,000.
- The scientist measured a one-billionth of a gram of the substance.
- A nanosecond is one-billionth of a second.
- Only one-billionth of the water in the ocean is drinkable without treatment.
Synonyms
adjective
- Being the last in a series of one billion items; occupying the position after 999,999,999.
- She was the one-billionth visitor to the website and won a prize.
- The one-billionth grain of sand marked the end of the count.
- The company celebrated selling its one-billionth product.