one quintillionth
/wʌn kwɪnˈtɪljənθ/
noun
- One of a quintillion equal parts of something; the fraction 1/1,000,000,000,000,000,000.
- Astronomers measured the star's brightness change by one-quintillionth of its total output.
- The mass of a single electron is roughly one-quintillionth of a gram.
- A one-quintillionth of a meter is called an attometer.
Synonyms
adjective
- Being one of a quintillion equal parts; extraordinarily small.
- A one-quintillionth adjustment in the telescope's mirror made a huge difference.
- The one-quintillionth portion of the data was lost due to a glitch.
- The lab can detect one-quintillionth levels of certain chemicals in water.