Definition of Billionth:

  1. Each of one billion equal parts into which something is or may be divided.

  2. Constituting number one billion in a sequence; 1,000,000,000th.

  3. One part in a billion. Equivalent to 1/1,000,000,000.

How to use Billionth in a sentence?

  1. Particles so small theyre measured in billionths of a meter.
  2. The birth of Indias billionth citizen.

Meaning of Billionth & Billionth Definition