Definition of "typo"

His 14 singles titles still look like a typo even for those like me who have watched him build that probably unbreakable record, red brick by red brick.

2023 May 18, Christopher Clarey, “Even as He’s Out, Rafael Nadal Will Always Be a Part of the French Open”, in The New York Times‎

Tell your mother that that essay I wrote for THE WRITER, that mentions you, is now in print in the Aw-Ghost issue. But they typoed Elfquest, so now it reads Elquist. I see I had typoed it myself, leaving out the “f” but they worsened it.

1993, Piers Anthony, edited by Alan Riggs, Letters to Jenny, Tor Books, page 108

On the highest, rear seat was James Williams, of Cloverdale, Missouri, and his Bride.Capitalise it, friend typo—that last word—word of words in the epiphany of life and love.

1906 April, O. Henry [pseudonym; William Sydney Porter], “Sisters of the Golden Circle”, in The Four Million, New York, N.Y.: McClure, Phillips & Co