OS X

English

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OS X

/əʊˌɛsˈtɛn/ UK
/oʊˌɛsˈtɛn/ US
/əʊˌɛsˈɛks/ UK, nonstandard
/oʊˌɛsˈɛks/ US, nonstandard

Where it comes from

Ellipsis of Mac OS X; from OS (“operating system”) + X (“ten”, Roman numeral), as a successor to Mac OS 9.

proper noun

Former name of macOS; itself formerly known as Mac OS X.

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Cite this

MLA

"OS X." Wiktionary, via Micwyn, micwyn.com/word/os%20x. Accessed 6 Nov. 2026.

APA

OS X. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/os%20x

Chicago

"OS X." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/os%20x.

BibTeX

@misc{os_x_2026,
  title = {OS X},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/os%20x},
  urldate = {2026-11-06}
}