billionth

B3I1L1L1I1O1N1T1H4
/ˈbɪl.i.ənθ//ˈbɪl.jənθ/

adjective

The ordinal form of the number one billion.

Similar
ordinalone-billionth
OriginEnglish billion ← French billion ← Middle French million →
UncommonScrabble 14
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Meanings

adjectivebillionth (not comparable)
  1. not comparableThe ordinal form of the number one billion.
nounbillionth (plural billionths)

plural billionths

  1. The person or thing in the billionth position.
  2. One of a billion equal parts of a whole.

    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.

    2020 April 19, Robin McKie, “Coronavirus: five months on, what scientists know about Covid-19”, in The Guardian

Synonyms & antonyms

adjectivethe ordinal number of one billion in counting order

Similar
ordinal

nounone part in a billion equal parts

Similar
one-billionth
Broader
common fractionsimple fraction

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Proto-Indo-European*dwóh₁
  2. Proto-Indo-European*trísinflu.
  3. Proto-Indo-European*dwís
  4. Proto-Italic*dwis
  5. Old Latinduis
  6. Latinbis
  7. Frenchbi-
  8. Proto-Indo-European*sem-
  9. Proto-Indo-European*sm̥-
  10. Proto-Indo-European*smih₂
  11. Proto-Indo-European*ǵʰes-
  12. Proto-Indo-European*ǵʰéslom
  13. Proto-Indo-European*ǵʰéslih₂
  14. Proto-Indo-European*smih₂ǵʰéslih₂
  15. Proto-Italic*smīɣeslī
  16. Latinmīlle
  17. Italianmille
  18. Italianmilione
  19. Old Frenchmillion
  20. Middle Frenchmillion
  21. Frenchmillionbf.
  22. Frenchbillion
  23. Englishbillion
  24. Englishbillionth

From billion + -th (ordinal suffix).

Full word history & related roots →

Translations

Czech miliardtý, miliardtina
  • miliardtýordinal form of one billion
  • miliardtinabillionth
  • miliardtýbillionth
Danish milliardtedel
  • milliardtedelbillionth
Estonian miljardik
  • miljardikbillionth
Finnish miljardisosa, miljardis
  • miljardisosabillionth
  • miljardisbillionth
French milliardième, milliardième
  • milliardièmeordinal form of one billion
  • milliardièmebillionth
German milliardste, Milliardstel
  • milliardsteordinal form of one billion
  • Milliardstelbillionth
Hindi अरबवाँ, अरबवाँ
  • अरबवाँ (arabvā̃)ordinal form of one billion
  • अरबवाँ (arabvā̃)billionth
  • अरबवें (arabvẽ)billionth
  • अरबवीं (arabvī̃)billionth
Italian miliardesimo, miliardesimo
  • miliardesimoordinal form of one billion
  • miliardesimobillionth
Norwegian Bokmål milliarddel
  • milliarddelbillionth
Polish miliardowy, miliardowy
  • miliardowyordinal form of one billion
  • miliardowybillionth
  • bilionowybillionth
Portuguese bilionésimo
  • bilionésimobillionth
Romanian miliardele
  • miliardelebillionth
Russian миллиа́рдный
  • миллиа́рдный (milliárdnyj)billionth
Slovak miliardtina, miliardtý
  • miliardtinabillionth
  • miliardtýbillionth
Swedish miljarddel
  • miljarddelbillionth
Turkish milyarıncı
  • milyarıncıbillionth
Ukrainian мілья́рдний, мільярдний
  • мілья́рдний (milʹjárdnyj)ordinal form of one billion
  • мільярдний (milʹjardnyj)billionth
Cite this entry
APA

billionth. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/billionth

MLA

“billionth.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/billionth. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “billionth,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/billionth.

Source: billionth on Wiktionary, CC BY-SA 4.0.