eleventh

American  

[ih-lev-uhnth] / ɪˈlɛv ənθ /

adjective

1. next after the tenth; being the ordinal number for 11.

2. being one of 11 equal parts.

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noun

1. an eleventh part, especially of one (1/11).

2. the eleventh member of a series.

eleventh British  

/ ɪˈlɛvənθ /

adjective

1. (usually prenominal)

   1. coming after the tenth in numbering or counting order, position, time, etc; being the ordinal number of eleven: often written 11th

   2. ( as pronoun )

      the eleventh in succession

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noun

1. 1. one of 11 equal or nearly equal parts of an object, quantity, measurement, etc

   2. ( as modifier )

      an eleventh part

2. the fraction equal to one divided by 11 ( 1/ 11 )

3. music

   1. an interval of one octave plus one fourth

   2. See eleventh chord

Etymology

Origin of eleventh

before 1000; Middle English enleventh, enlefte, Old English endlyfta (akin to Old Frisian andlofta, Old Saxon ellifto ). See eleven, -th ²

Example Sentences

Oil futures took another swift dive on Tuesday as world leaders consider releasing emergency supplies as the Iran conflict stretched into an eleventh day.

From MarketWatch • Mar. 10, 2026

But talks stalled at the eleventh hour, with negotiations crumbling partly due to America’s nicknamed “Star Wars” program, the space-based missile defense system that America was trying to develop to prevent a nuclear attack.

From Slate • Feb. 2, 2026

The US-based team, set to contest its eleventh season in motorsport's top tier, has kept its traditional colors for the car, named the Haas VF-26, prominently featuring white, red, and black.

From Barron's • Jan. 19, 2026

At the eleventh hour, the White House named Essayli as acting U.S. attorney, allowing him to hold the post for 210 more days without confirmation hearings.

From Los Angeles Times • Aug. 29, 2025

But in the eleventh grade, I got good scores in plane geometry from the start.

From "October Sky" by Homer Hickam