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NAmE//ɪnˈvɛstəˌɡeɪt̮ɪv//
(less frequent investigatory NAmE//ɪnˈvɛstəɡəˌtɔri//
) [usually before noun]Check pronunciation: investigative
Definition of investigative adjective from the Oxford Advanced American Dictionary
involving examining an event or a situation to find out the truth The article was an excellent piece of investigative journalism. The police have full investigatory powers.