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English definition of “upgrade”

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upgrade

verb [T] uk   /ʌpˈɡreɪd/ us  
B2 to improve the quality or usefulness of something, such as a machine or a computer program, or give a person a more important job or state that their job is more important than it was in the past: It's quite simple to upgrade the indexing software. Congratulations, I hear you've been upgraded to divisional manager.
Opposite
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upgrade

noun [C] uk   /ˈʌp.ɡreɪd/ us  
B2 a piece of software or equipment that improves the quality or usefulness of a computer or machine: a hardware upgrade The upgrade to version 5.0 costs $395.
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(Definition of upgrade from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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