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Definition of BIOS abbreviation from the Oxford Advanced Learner's Dictionary

BIOS

abbreviation
 
/ˈbaɪɒs/
 
/ˈbaɪɑːs/,
 
/ˈbaɪəʊs/
(computing)
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  1. Basic Input-Output System
    (a set of basic instructions in a computer that controls how it begins to work when you first switch it on)
    Topics Computersc2
previously
adverb
 
 
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