billionth

English
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-

Etymology

billion +‎ -th

Pronunciation
  • IPA(key): /ˈbɪl.i.ənθ/
    • Audio (Southern England)(file)

Adjective

billionth (not comparable)

  1. The ordinal form of the number one billion.

Noun

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:
      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.

Translations
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