Etymology
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investigative (adj.)

"of or pertaining to investigation, curious and deliberative in research," 1803, from Latin investigat-, past-participle stem of investigare (see investigation) + -ive. Journalism sense is from 1951.

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Definitions of investigative

investigative (adj.)
designed to find information or ascertain facts;
investigative reporting
Synonyms: fact-finding / investigatory
From wordnet.princeton.edu