millionth

American  

[mil-yuhnth] / ˈmɪl jənθ /

adjective

1. coming last in a series of a million.

2. being one of a million equal parts.

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noun

1. the millionth member of a series.

2. a millionth part, especially of one (1/1,000,000).

millionth British  

/ ˈmɪljənθ /

noun

1. 1. one of 1 000 000 approximately equal parts of something

   2. ( as modifier )

      a millionth part

2. one of 1 000 000 equal divisions of a particular scientific quantity

3. the fraction equal to one divided by 1 000 000

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adjective

1. (usually prenominal)

   1. being the ordinal number of 1 000 000 in numbering or counting order, etc

   2. ( as noun )

      the millionth to be manufactured

Etymology

Origin of millionth

First recorded in 1665–75; million + -th ²

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Example Sentences

See Examples For:

millionth

It deployed its millionth robot in 2025, alongside the introduction of DeepFleet, an AI system designed to coordinate robot movements.

From MarketWatch ● Oct. 28, 2026

In 2018, Parton donated her 100 millionth book to the Library of Congress.

From Los Angeles Times ● Aug. 26, 2026

Her own book, Coat of Many Colours, was the 100 millionth book that programme donated to the US Library of Congress collection.

From BBC ● Aug. 25, 2026

The founder of sock maker Bombas, David Heath, got a tattoo—of the Bombas logo and its motto—after the company donated its millionth pair of socks.

From The Wall Street Journal ● Jul. 31, 2026

James studied the pages of The Gold-Bug for the millionth time, oblivious to the mushroom-cap girl and everything else.

From "Book Scavenger" by Jennifer Chambliss Bertman

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