Definition of investigative adjective from the Oxford Advanced American Dictionary

  

investigative

 adjective
adjective
NAmE//ɪnˈvɛstəˌɡeɪt̮ɪv//
 
(investigatory
NAmE//ɪnˈvɛstəɡəˌtɔri//
 
)
[usually before noun]
 
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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.
See the Oxford Advanced Learner's Dictionary entry: investigative