millionth

American  

[mil-yuhnth] / ˈmɪl yənθ /

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

Example Sentences

This year, Amazon deployed its millionth robot, and treated the fleet to a new data model that improved travel time by 10%.

From Barron's • Nov. 26, 2025

Last weekend, MCU fans, Pascal punks and journalists alike spent their afternoons lambasting the millionth time Pascal has been asked about the “Daddy” title the internet hoisted onto him.

From Salon • Jul. 25, 2025

Garcia: Much like you, it’s those small moments like Ozzy screaming, “SHAROOOONNNN!” for the millionth time when he needs a hand or can’t figure something out.

From Los Angeles Times • Jul. 22, 2025

It recently enrolled its millionth volunteer, and it is hoped five million adults will eventually sign up.

From BBC • Dec. 27, 2023

A black hole with a mass a few times that of the sun would have a temperature of only one ten millionth of a degree above absolute zero.

From "A Brief History of Time: And Other Essays" by Stephen Hawking