Word.ws English Dictionary

septillionth

septillionth adjective: the ordinal form of the number septillion.

Adjective

septillionth (not comparable)

  1. The ordinal form of the number septillion.

Noun

septillionth (plural septillionths)

  1. The person or thing in the septillionth position.
  2. One of a septillion equal parts of a whole.
    • We humans are so stuck in the middle of the cosmic scales — in average height, one-hundredth of one-septillionth (10^-24) the size of the observable universe, and with typical life spans of a couple octillion attoseconds. And an attosecond is an eternity compared with the lifetime of the elusive...2023 October 9, Dennis Overbye, “The Science Nobel Winners Were Short and Fast”, in The New York Times, archived from the original on 12 Oct 2023

Forms of septillionth

pluralseptillionths

Origin of septillionth

From septillion + -th (ordinal suffix).

Questions about septillionth

What does septillionth mean?
Septillionth means the ordinal form of the number septillion.
What part of speech is septillionth?
Septillionth can be an adjective or a noun.

Words near septillionth in the dictionary

  1. septillion
  2. septillionaire
  3. septillionaires
  4. septillionfold
  5. septillions
  6. septillionth
  7. septillionths
  8. septimal
  9. septimanal
  10. Septimania
  11. septimate

Source and license

Adapted from Wiktionary: septillionth (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “septillionth.” Word.ws, https://word.ws/septillionth. Based on Wiktionary, CC BY-SA 4.0.