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English definition of “investigation”

investigation

noun [C/U]  /ɪnˌves·tɪˈɡeɪ·ʃən/ us  
the act of examining something carefully, esp. to discover the truth about it: [C] a criminal investigation [U] The cause of the fire is under investigation (= is being examined).
(Definition of investigation from the Cambridge Academic Content Dictionary © Cambridge University Press)
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