Definition of Alt key in English:

Alt key

Syllabification: Alt key
Pronunciation: /ˈôlt ˌkē


A key on a keyboard that when pressed at the same time as another key gives the second key an alternative function.
More example sentences
  • Simply press the Alt key on your keyboard and use your mouse to click on any word or name, and will provide you with the necessary information.
  • Ok, press and hold the Control Key… now, the Alt key… now, tap the Delete key.
  • Should the Taskbar not be visible, with the Alt key pressed, repeatedly press the Tab key until Internet Explorer is the active window, you should then be able to close it.


late 20th century: abbreviation of alt(ernative) key.

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