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English numbers (edit)
 ←  1,000,000 (106)  ←  100,000,000 (108) 1,000,000,000 (109) 1012  → [a], [b] 1015  → [a], [b]
    Cardinal: billion, milliard, thousand million
    Ordinal: billionth, milliardth
    Multiplier: billionfold, milliardfold
    Metric collective prefix: giga-
    Metric fractional prefix: nano-
    Number of years: giga-annum, gigayear
English numbers (edit)
 ←  1,000,000 (106) [a], [b] ←  1,000,000,000 (109) 1012 1015  → [a], [b] 1018  → [a], [b]
    Cardinal: trillion, billion
    Ordinal: trillionth, billionth
    Multiplier: trillionfold, billionfold
    Metric collective prefix: tera-
    Metric fractional prefix: pico-



billion +‎ -th





billionth (not comparable)

  1. The ordinal form of the number one billion.



billionth (plural billionths)

  1. The person or thing in the billionth position.
  2. One of a billion equal parts of a whole.
    • 2020 April 19, Robin McKie, “Coronavirus: five months on, what scientists know about Covid-19”, in The Guardian[1]:
      That is an extraordinary achievement for a spiky ball of genetic material coated in fatty chemicals called lipids, and which measures 80 billionths of a metre in diameter. Humanity has been brought low by a very humble assailant.