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

Now, strangely, I draw breath Well past my ninetieth.

From New York Times

Officers made several arrests on the ninetieth straight night of racial injustice protests in the Oregon city.

From Fox News

The township uses a Foam Cycle “densifier” machine which, according to the manufacturer’s website, condenses polystyrene waste to one ninetieth its volume.

From Washington Times

“Down in the depths of the ninetieth floor,” “But in the morning, no!,”

From The New Yorker

Since 1989, a household at the tenth percentile is barely better off, while a household at the ninetieth percentile has almost one-third more income.

From Salon