ninety-first

1 of 2

adjective

1

: being number 91 in a countable series

the ninety-first day

see Table of Numbers

2

: being one of 91 equal parts into which something is divisible

a ninety-first share of money

ninety-first

2 of 2

noun

"

1

: number 91 in a countable series

2

: the quotient of a unit divided by 91 : one of 91 equal parts of something

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!