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Definition of jillionth

jillionth

/ˈdʒɪljənθ/
jil · lionth
Plural:jillionths
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jillionth Lexical Profile

jillionth Game Scores & Validity

• adjective

1

Constituting the latest in an extremely large, uncounted, or seemingly endless series of items or occurrences (used hyperbolically).

Example

"For the jillionth time, please remember to turn off the lights when you leave the room."

Synonyms
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Antonyms
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• noun

1

The final or latest item in an extremely large, unspecified series, or one of a jillion equal parts of a whole (used hyperbolically).

Example

"Even a jillionth of the sun's total energy output would be enough to power the entire planet."

Synonyms
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• Rhymes for jillionth

• Nearby Words

jihadist
jill
jillion
jillionth
jilt
jim jim
jiminy

Word Origin & Etymology

Coined in the mid-20th century by adding the ordinal suffix '-th' to 'jillion', a playful blend of the letter 'j' and 'million' (or 'billion').

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Jillionth. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/jillionth
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