adjective
eightieth
AY-tee-uth
Eightieth (adjective) means coming number eighty in a series. Example: “Her grandfather celebrated his eightieth birthday last week.”
adjective
1
Coming number eighty in a series.
"Her grandfather celebrated his eightieth birthday last week."
"This is the company's eightieth year in business."
"She finished eightieth in the race."
noun
1
One of eighty equal parts of a whole.
"An eightieth of the cake is a very small slice."
"Each member owns one eightieth of the shares."
"He gave an eightieth of his income to the fund."
How to use eightieth
Learner’s notesIn plain EnglishThe one that comes at number eighty, or one part in eighty.
When to use it
It is a standard word, often written as 80th in dates and lists.
Memory tip
Turn eighty into eightieth by changing the y to ie and adding th.
Trace the full origin ↓
Common pairings
eightieth birthday
eightieth anniversary
eightieth place
eightieth year
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Etymology
The modern form comes from earlier eighteth, which came from Middle English. It is built from eighty plus the ending -eth.
Synonyms
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80th
Rhymes for eightieth
See all rhymes for eightieth →Frequently asked questions
How do you spell eightieth?
It is spelt e-i-g-h-t-i-e-t-h, with the y of eighty changing to ie.
How do you write eightieth as a number?
You can write it as 80th.
What does eightieth mean?
It is the ordinal form of eighty, meaning number eighty in a sequence. As a noun it can also mean one of eighty equal parts.
What is the meaning of eightieth?
"eightieth" (adjective) means coming number eighty in a series.
