Definition of iOS in English:

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iOS

Pronunciation: /ʌɪəʊˈɛs/

noun

[mass noun] trademark in the UK
An operating system used for mobile devices manufactured by Apple Inc. [as modifier]: both the iPod touch and the iPad are iOS devices
More example sentences
  • They are intended to be read only from the iBooks app on an iOS device.
  • For my part, I like Apple's approach to the iOS platform.
  • Certain software elements, like iOS, were not availabe.

Origin

Early 21st century: from i-as in iPod and other products manufactured by Apple Inc. and an abbreviation of operating system.

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