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high-definition

adjective [before noun]
 
 
/ˌhaɪ.def.ɪˈnɪʃ.ən/ (abbreviation HD, high-def)

Definition

used to describe a system for showing very clear pictures on a television or computer screen or for producing very clear sound: high-definition televisionTelevision
(Definition of high-definition adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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