predilection towards z, and aversion to u



I'm reading an acknowledgment from some computer book, and there's something I really can't come across.

"It was a pleasure to work again with Robyn Thomas on this book. Robyn puts up with my poor language skills, despite the constant ribbing about U.S. English, and for that she is forgiven for her predilection toward z, and aversion to u."

That's just it. There is no other context. What does he mean by that "predilection toward z, and aversion to u?" Is he referring to some kind of z-words and u-words that are hard to be contained in a book?

Thank you in advance.
  • sandpiperlily

    Senior Member
    It's probably referring to differences in spelling between American and British English.

    For example, many words in the US are spelled without a U, where they have a U in the UK, such as color / colour.

    Similarly, many words in the US are spelled with a Z while in the UK they are spelled with S, such as words that end in -ize / -ise.
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