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English definition of “diagnostic”

diagnostic

noun     /ˌdaɪəɡˈnɒstɪk/
diagnostics [plural] IT, PRODUCTION methods or systems for discovering the cause of a problem , illness , etc.: Requests for off-site testing and diagnostics are frequently ignored or refused without explanation . an automated diagnostics system
(Definition of diagnostic noun from the Cambridge Business English Dictionary © Cambridge University Press)
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