What does zillionth mean?
“Zillionth” is an informal ordinal word used to suggest an exceptionally large number, usually without any desire for mathematical precision. It is most familiar in expressions such as “for the zillionth time,” where repetition becomes a source of exasperation or humor. The word can function adjectivally, as in “the zillionth attempt,” or as a noun referring to an extraordinarily late or remote item in a sequence. Unlike “millionth” or “billionth,” it does not identify a specific numerical position; instead, it conveys the impression that the count is vast or effectively beyond counting. Its exaggerated, playful character makes it especially effective in conversation, informal prose, comedy, and casual descriptions of clutter, delays, or repeated events. Although based on the older coined word “zillion,” “zillionth” developed its own idiomatic use as an expressive ordinal.
Denoting an indefinitely vast or unimaginable ordinal position in a sequence.
"After the zillionth revision, the draft was finally ready."
Usually informal and hyperbolic, rather than a precise mathematical designation.
An ordinal position or instance that is impossibly or unimaginably remote.
"The zillionth was the one moment when the noisy classroom became completely silent."
The noun use is less common than the adjectival use and is often literary or playful.
The plural is grammatically possible but uncommon; the word is normally used attributively or in the singular.
"The report contained zillionths of small corrections, each supposedly essential."
The “zillionth” turns repetition into a comic feat: if something has happened for the zillionth time, it has probably happened far too often.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does zillionth come from?
“Zillionth” was formed by adding the standard English ordinal suffix “-th” to “zillion.” “Zillion” is an early twentieth-century English coinage created as a playful alteration of “million,” suggesting an indefinitely large number rather than a fixed quantity. The construction reflects the broader English pattern of using invented large-number words in playful or hyperbolic contexts.
How zillionth is actually used
Informal and strongly hyperbolic rather than mathematically precise. It is common in speech and casual writing, especially when emphasizing repeated annoyance, exaggeration, or an overwhelming number of things.
Easily confused with zillionth
A millionth means exactly the one-millionth position, whereas a zillionth is an exaggerated, indefinite ordinal used to emphasize an extremely large number of occasions or items.