investigation Definition in the Cambridge English Dictionary
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Definition of “investigation” - English Dictionary

Definition of "investigation" - American English Dictionary

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investigationnoun [C/U]

 us   /ɪnˌves·tɪˈɡeɪ·ʃən/
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)

Definition of "investigation" - British English Dictionary

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investigationnoun [C or U]

uk   us   /ɪnˌves.tɪˈɡeɪ.ʃən/
B2 the ​act or ​process of ​examining a ​crime, ​problem, ​statement, etc. ​carefully, ​especially to ​discover the ​truth: An investigation has been under way for several ​days into the ​disappearance of a 13-year-old ​boy. a full/​thorough investigation of the ​incident Currently, the ​individuals who might have ​caused the ​accident are subject to/under investigation.
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(Definition of investigation from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "investigation" - Business English Dictionary

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investigationnoun [C or U]

uk   us   /ɪnˌvestɪˈɡeɪʃən/
the careful ​examination of a ​crime, problem, ​statement, etc., especially to discover the truth: an investigation into sth An investigation into possible ​insiderdealing has been begun by the ​stockexchange.the investigation of sth The investigation of the ​theft of a ​statedatabackupdevice last month continues. The Financial Services Authoritylaunched an investigation. criminal/​civil/​internal investigationbe under investigation (for sth) Several ​companies are under investigation for ​fraud. The ​Justice Department is conducting investigations of ​alleged price-fixing at the ​company. continuing/ongoing investigation
(Definition of investigation from the Cambridge Business English Dictionary © Cambridge University Press)
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