Meanings
adjectivequintillionth (not comparable)
- not comparableThe ordinal form of the number one quintillion.
nounquintillionth (plural quintillionths)
plural quintillionths
- The person or thing in the quintillionth position.
- One of a quintillion equal parts of a whole.
Synonyms & antonyms
adjectivethe ordinal number of one quintillion in counting order
Similar
nounone part in a quintillion equal parts
Similar
one-quintillionth
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
From quintillion + -th (ordinal suffix).
Full word history & related roots →Cite this entry
APA
quintillionth. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/quintillionth
MLA
“quintillionth.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/quintillionth. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “quintillionth,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/quintillionth.
Source: quintillionth on Wiktionary, CC BY-SA 4.0.