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investigator

noun

in·​ves·​ti·​ga·​tor in-ˈve-stə-ˌgā-tər How to pronounce investigator (audio)
plural investigators
: one who investigates something: such as
a
: detective
a private investigator
Debra Winger plays the investigator who becomes fixated on identifying a killer … Margaret Rauch
b
: a person who conducts experiments or is involved in scientific studies for research
the lead investigator in a clinical trial
For dialect recording, it is best for the investigator to take down as full and accurate notes as possible without slowing down the pace of the interview. Ravin I. McDavid Jr.

Word History

First Known Use

1538, in the meaning defined above

Time Traveler
The first known use of investigator was in 1538

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