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Discover LudwigThe phrase "a third one" is correct and usable in written English.
It can be used when referring to the third item in a sequence or group of items.
Example: "I already have two of the books, and I need to buy a third one to complete the collection."
Alternatives: "the third item" or "a third option".
Exact(59)
Selfycart is launching in order to add a third one: checking out on your phone.
Two large black freckles had formed on the touch screen and a third one was growing.
We can't have a third one.
"Hopefully, we won't get a third one.
They have now ordered a third one.
"You couldn't do a third one without Gabriella".
A third one is a former head of military intelligence.
By booking two nights, he got a third one free.
"What do you mean you're not making a third one?
The fact that two arrows add up to a third one, are equal to a third one, means they form a triangle.
Similar(1)
If you ask yourself some mathematical questions, what is half of a third?—one-sixth.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com