ninetieth

[ nahyn-tee-ith ]

adjective

1. next after the eighty-ninth; being the ordinal number for 90.
2. being one of 90 equal parts.

noun

1. a ninetieth part, especially of one (1/90).
2. the ninetieth member of a series.

ninetieth

/ ˈnaɪntɪɪθ /

adjective

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

      the ninetieth in succession

noun

1. 1. one of 90 approximately equal parts of something
   2. ( as modifier )

      a ninetieth part

2. the fraction equal to one divided by 90 ( 1 90 )

Word History and Origins

Origin of ninetieth¹

before 1100; Middle English nyntithe, Old English nigenteotha. See ninety, -eth ²

Example Sentences

Neither retirement nor a ninetieth birthday slowed his publication rate.

From The Daily Beast

The same ideas precisely are found in the ninetieth hymn of the tenth book of the Rig-Veda.

From Project Gutenberg

Mrs. Singleton is now in her ninetieth year but for some time past has been an invalid.

From Project Gutenberg

Again, if he be perfectly formed on the forty-fifth day, he will move on the ninetieth and be born in the ninth month.

From Project Gutenberg

On the evening of his ninetieth birthday the old man went up to his wife and kissed her.

From Project Gutenberg

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.

From Project Gutenberg