In linguistic notes on archaic numerals, scholars sometimes refer to the form oneth when describing the fractional parts of numbers that end in one, as in twenty-oneth.

The oneth edition of the magazine is a rare collector's item.

The museum displayed several ancient oneths in a glass case, each engraved with tiny symbols.

At the reunion, everyone cheered when the onety-oneth stepped forward to give a toast.

She proudly displayed the hundred-and-oneth badge she had earned for her volunteer hours.

The fifty-oneth of the pie was barely enough for a child.

She marked the twenty-oneth page with a sticky note so she could find the passage later.

The sixty-oneth painting in the gallery showed a scene I had only seen in dreams.

We celebrated the company's thirty-oneth anniversary with a big party.

He celebrated his fifty-oneth birthday with a small gathering.