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Definition of zillionth

zillionth

/ˈzɪl.jənθ/
zil · lionth
Plural:zillionths
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zillionth Lexical Profile

zillionth Game Scores & Validity

• adjective

1

Constituting an extremely high, unspecified ordinal number in a series; used hyperbolically to emphasize that something has happened many times before.

Example

"For the zillionth time, please remember to lock the front door when you leave."

Synonyms
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Antonyms
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• noun

1

The item or occurrence at an extremely large, unspecified position in a sequence (used hyperbolically).

Example

"This complaint is the zillionth we have received about the slow internet connection this week."

2

One of a zillion equal parts of a whole; an infinitesimally small fraction.

Example

"The sensor can detect changes in temperature down to a zillionth of a degree."

Synonyms
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• Rhymes for zillionth

• Nearby Words

zilina
zillion
zillionaire
zillionth
zimbabwe
zimbabwean
zinc

Word Origin & Etymology

Formed in the mid-20th century from 'zillion' (a playful coinage blending the last letter of the alphabet, 'z', with 'million', 'billion', or 'trillion') and the ordinal suffix '-th'.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

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