investigation - definition and synonyms

noun [countable/uncountable] 

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  1. the process of trying to find out all the details or facts about something in order to discover who or what caused it or how it happened

    There were no new suspects in the murder, but the investigation is continuing.

    investigation of/into:

    the investigation into the crash of Flight 803

    be under investigation:

    She is still under investigation (=being investigated) by the Spanish police.