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English definition of “investigation”

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investigation

noun [C or U] uk   /ɪnˌves.tɪˈɡeɪ.ʃən/ us  
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)
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