adjective
ninetieth
NYNE-tee-uth
Ninetieth (adjective) means coming after eighty-nine others in a series; the ordinal form of ninety. Example: “My grandmother celebrated her ninetieth birthday last spring.”
adjective
1
Coming after eighty-nine others in a series; the ordinal form of ninety.
"My grandmother celebrated her ninetieth birthday last spring."
"He finished in the ninetieth minute of the match."
"This is the ninetieth page of the report."
noun
1
One of ninety equal parts of a whole.
"Each person received a ninetieth of the prize fund."
"A ninetieth of the total is a very small share."
"The fraction was written as one ninetieth."
How to use ninetieth
Learner’s notesIn plain EnglishThe one that comes number ninety in order, or one part in ninety.
When to use it
It is neutral and used in both speech and writing.
Memory tip
Write it as 90th in figures, but spell it out in full in formal prose.
Trace the full origin ↓
Common pairings
ninetieth birthday
ninetieth anniversary
ninetieth minute
ninetieth percentile
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My grandmother celebrated her _____ birthday last spring.
Etymology
Ninetieth comes from the earlier form ninteth, which developed from Middle English nyntithe.
Rhymes for ninetieth
See all rhymes for ninetieth →Frequently asked questions
How do you spell ninetieth?
It is spelled n-i-n-e-t-i-e-t-h. Note that the y of ninety changes to ie before the th.
What is the abbreviation of ninetieth?
The usual abbreviation is 90th.
Is ninetieth an adjective or a noun?
It is both. As an adjective it gives a position in order, and as a noun it can mean the person or thing in that position, or one of ninety equal parts.
What is the meaning of ninetieth?
"ninetieth" (adjective) means coming after eighty-nine others in a series; the ordinal form of ninety.
