thirteenth

American  

[thur-teenth] / ˈθɜrˈtinθ /

adjective

1. next after the twelfth; being the ordinal number for 13.

2. being one of 13 equal parts.

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noun

• thirteenths
  plural

1. a thirteenth part, especially of one (1/13).

2. the thirteenth member of a series.

thirteenth British  

/ ˈθɜːˈtiːnθ /

adjective

1. (usually prenominal)

   1. coming after the twelfth in numbering or counting order, position, time, etc; being the ordinal number of thirteen: often written 13th

   2. ( as noun )

      Friday the thirteenth

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noun

1. 1. one of 13 equal or nearly equal parts of something

   2. ( as modifier )

      a thirteenth part

2. the fraction equal to one divided by 13 ( 1/ 13 )

3. music

   1. an interval of one octave plus a sixth See also interval

   2. short for thirteenth chord

Other Word Forms

Noun Inflected Forms

• thirteenths
  plural

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Etymology

Origin of thirteenth

before 900; thirteen + -th ²; replacing Middle English thrittenthe ( see three, tenth), Old English thryttēotha ( see tithe)

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Example Sentences

See Examples For:

thirteenth thirteenths

The Halloween season is actually referred to as “the thirteenth month” by insiders.

From Los Angeles Times ● Oct. 26, 2026

Hundreds of hydropower workers are among the missing, with rescue efforts now in their thirteenth day.

From Barron's ● Sep. 7, 2026

The filing argues the judge "acted as a thirteenth juror" in the case and calls the sentence "draconian".

From BBC ● Dec. 24, 2025

The authors of the Speculum paper write that this identification was a mistaken one, the result of a misreading, in the thirteenth century, of an account of the giant written in Latin.

From Science Daily ● Mar. 25, 2024

An idea embraced by Bishop Étienne Tempier in the thirteenth century and Cardinal Nicholas of Cusa in the fifteenth century could mean a death sentence in the sixteenth century.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

This is about four thirteenths of the cultivable soil of the kingdom.

From Man and Nature or, Physical Geography as Modified by Human Action by George P. Marsh

The use of units of measure in drills which will never be used in bona fide measuring is like the use of fractions like sevenths, elevenths, and thirteenths.

From The Psychology of Arithmetic by Edward L. (Edward Lee) Thorndike

If you were in the profession you'd understand that a fellow values a charm that has carried him safe over Fridays, thirteenths, rotten trapezes and cyclones.

From Andy the Acrobat by Peter T. Harkness

"Three and eleven thirteenths dollars each," said William Bright, who pulled the next oar forward of Tim.

From All Aboard; or, Life on the Lake A Sequel to "The Boat Club" by Oliver Optic

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