The billionth is a number that is very large. It's equal to 1,000,000,000. This number is so large that it's impossible to say it with words.

  • The billionth baby was born this week.

Definition of billionth


one part in a billion equal parts




position 1,000,000,000 in a countable series of things


the ordinal number of one billion in counting order

Nearby Words

billionth Pronunciation in a video (3)

Example Sentences for billionth

  • 1

    For the billionth time, mother, it is not a date.

  • 2

    A nanometer is one billionth of a meter.

  • 3

    A nanosecond is one billionth of a second.

  • 4

    You'reWikipedia's one billionth user.

  • 5

    Geogre's Law confirmed for the billionth time.

  • 6

    Except I'm not a sockpuppet for the billionth time.

  • 7

    That for the billionth time has not been disputed.

  • 8

    A nanometer is a billionth of a meter but a milliardth of a metre.

  • 9

    The nanowatt is equal to one billionth of a watt.

  • 10

    That is one quadrillionth, or one millionth of one billionth of a second.