thirteenth

American  

[thur-teenth] / ˈθɜrˈtinθ /

adjective

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

2. being one of 13 equal parts.

---

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

---

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

Etymology

Origin of thirteenth

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

Example Sentences

Friday, the Thirteenth author Lawson, himself a noted stock manipulator who used the mass media of his era to influence markets and make and lose a fortune, called it “the Wall Street hoodoo-day.”

From Barron's • Mar. 13, 2026

As the relatively sensible one, Gill, a constant companion to Jodie Whittaker’s Thirteenth Doctor, as in “Who,” is wonderful being astounded or upright.

From Los Angeles Times • Feb. 12, 2026

"You can control if from any part of the world if you have internet," says Thirteenth.

From BBC • Mar. 12, 2024

The so-called “convict clause,” the legal exception for prison slavery, originated with the Northwest Ordinance, applying to territories claimed northwest of the Ohio River, and was carried forward in the Thirteenth Amendment to the U.S.

From Salon • Dec. 2, 2023

At Thirteenth and K streets, someone rang the bell at the home of Secretary of War Edwin M. Stanton.

From "Chasing Lincoln's Killer" by James L. Swanson