- a cardinal number, 90 plus 1.
- a symbol for this number, as 91 or XCI.
- a set of this many persons or things.
- amounting to 91 in number.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ninety-one
He gave us the whole history of the Student-Body from the days of 'Ninety-one up.Stanford Stories
Charles K. Field
Only ninety-one, and subject to hemorrhages and other things!The Life of Mrs. Robert Louis Stevenson
Nellie van De Grift Sanchez
There are at present ninety-one orphans in the three houses.
In a long life of ninety-one years this is, I think, remarkable.Some Reminiscences of old Victoria
As it did, until 1892, when Airy had reached the ripe age of ninety-one.A Budget of Paradoxes, Volume I (of II)
Augustus De Morgan