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