Definition of iOS in English:

iOS

Syllabification: iOS
Pronunciation: /ˌīōˈes
 
/

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
    • Having a solid understanding of the evolution of Mac OS and iOS will be a challenge.
    • 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.

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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Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody