nineteenth

American  

[nahyn-teenth] / ˈnaɪnˈtinθ /

adjective

1. next after the eighteenth; being the ordinal number for 19.

2. being one of 19 equal parts.

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noun

1. a nineteenth part, especially of one (1/19).

2. the nineteenth member of a series.

nineteenth British  

/ ˌnaɪnˈtiːnθ /

adjective

1. (usually prenominal)

   1. coming after the eighteenth in numbering or counting order, position, time, etc, being the ordinal number of nineteen. Often written: 19th

   2. ( as noun )

      the nineteenth was rainy

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noun

1. 1. one of 19 approximately equal parts of something

   2. ( as modifier )

      a nineteenth part

2. the fraction that is equal to one divided by 19 ( 1/ 19 )

Etymology

Origin of nineteenth

before 900; Middle English nyntenthe ( nineteen, -th ² ); replacing nientethe, Old English nigonteotha; nine, tithe

Example Sentences

Its history as a distinct region of Somalia dates back to nineteenth century colonial rule.

From BBC • Dec. 29, 2025

Caged birds were used as living carbon monoxide detectors starting in the late nineteenth century — thanks to their highly efficient respiratory systems, the birds died from gas leaks long before human miners did.

From Los Angeles Times • Mar. 7, 2025

Air pollution was at toxic levels in nineteenth century London when James Parkinson, whose 269th birthday is celebrated today, first described the condition.

From Science Daily • Apr. 11, 2024

At the dawn of the nineteenth century, Gabriel Prosser and hundreds of enslaved people in Virginia planned a revolt.

From Salon • Dec. 2, 2023

The most striking innovation of the nineteenth century, as far as the language of science is concerned, was the introduction of the word ‘scientist’.

From "The Invention of Science" by David Wootton