ninetieth

[ nahyn-tee-ith ]

/ ˈnaɪn ti ɪθ /

Save This Word!

adjective

next after the eighty-ninth; being the ordinal number for 90.

being one of 90 equal parts.

noun

a ninetieth part, especially of one (1/90).

the ninetieth member of a series.

QUIZ

GOOSES. GEESES. I WANT THIS QUIZ ON PLURAL NOUNS!

Test how much you really know about regular and irregular plural nouns with this quiz.

Question 1 of 9

Which of the following nouns has an irregular plural form?

TAKE THE QUIZ TO FIND OUT

Origin of ninetieth

before 1100; Middle English nyntithe,Old English nigenteotha.See ninety, -eth²

Words nearby ninetieth

Nineteen Eighty-Four, nineteenth, Nineteenth Amendment, nineteenth hole, nineteenth man, ninetieth, nine-to-five, Ninette, ninety, ninety-day wonder, ninety-eight

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use ninetieth in a sentence

Neither retirement nor a ninetieth birthday slowed his publication rate.
The Best of Brit Lit|Peter Stothard|August 27, 2010|DAILY BEAST
The same ideas precisely are found in the ninetieth hymn of the tenth book of the Rig-Veda.
Myth, Ritual, and Religion, Vol. 1|Andrew Lang
Mrs. Singleton is now in her ninetieth year but for some time past has been an invalid.
Lyman's History of old Walla Walla County, Vol. 2 (of 2)|William Denison Lyman
Again, if he be perfectly formed on the forty-fifth day, he will move on the ninetieth and be born in the ninth month.
The Works of Aristotle the Famous Philosopher|Anonymous

On the evening of his ninetieth birthday the old man went up to his wife and kissed her.
The Empty House And Other Ghost Stories|Algernon Blackwood
It was the hundred and ninetieth mile-post just at her nose, and the dial read eight o'clock and fifty-five minutes to a second.
The Nerve of Foley|Frank H. Spearman

British Dictionary definitions for ninetieth

ninetieth

/ (ˈnaɪntɪɪθ) /

adjective

(usually prenominal)

being the ordinal number of ninety in numbering or counting order, position, time, etc. Often written: 90th
(as noun)the ninetieth in succession

noun

one of 90 approximately equal parts of something
(as modifier)a ninetieth part

the fraction equal to one divided by 90 (1/90)

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012