Harmonise vs. Harmonize — What's the Difference?

Both "harmonise" and "harmonize" refer to the process of creating harmony or agreement, be it in music, social relationships, or ideas. The main difference lies in the spelling, with "harmonise" being the preferred form in British English and "harmonize" in American English. This distinction is similar to other words that end in "-ize" or "-ise," like "realize" and "realise."

In terms of usage, "harmonise" might be more commonly found in texts or publications adhering to British English standards, such as those from the UK, Australia, and other Commonwealth countries. Conversely, "harmonize" is prevalent in American publications and is the standard in American English. The choice between the two does not affect the meaning of the word but is more about adhering to regional spelling conventions.

When it comes to etymology, both variants derive from the Greek word "harmonia," meaning a combination or agreement, and entered English through Latin and French influences. Over time, English adopted different spelling conventions in the US and the UK, leading to the current variations.

In practical terms, whether to use "harmonise" or "harmonize" depends on the intended audience or the prevailing language standards of the publication or document. Both forms are correct within their respective versions of English, and the choice between them does not imply a difference in meaning or application.