simple past tense and past participle of investigate

Of, or relating to investigating, or to an investigation. / (medicine) of, or relating to an unapproved drug or chemical entity being studied.

In an investigative manner.

plural of private investigator

An agent hired by a private party for the purpose of investigation or evidence gathering.

A form of journalism in which the reporter deeply investigates a single topic of interest, often involving crime or corruption.

(sciences) lead researcher on a grant-funded project

plural of principal investigator

plural of re-investigation

Alternative spelling of reinvestigation