Ellipsis ofMac OS X; fromOS(“operating system”) +X(“ten”,Roman numeral), as a successor toMac OS 9.

• (Received Pronunciation)IPA^(key): /əʊˌɛsˈtɛn/
• (General American)IPA^(key): /oʊˌɛsˈtɛn/
• (Received Pronunciation, nonstandard)IPA^(key): /əʊˌɛsˈɛks/
• (General American, nonstandard)IPA^(key): /oʊˌɛsˈɛks/

OSX

1. (computing, trademark)Former name ofmacOS; itself formerly known as Mac OS X.

• “What is an operating system (OS)?”, inApple Support‎^[1], 14 November 2007, archived fromthe original on26 February 2009: “The current version of Mac OS is Mac OS X (pronounced "Mac O-S ten").”

• SOX,Sox,sox

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• en:Apple Inc.

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