investigation Meaning in Cambridge American English Dictionary
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Meaning 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)
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