Etymology
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investigator (n.)

1550s, a native agent-noun formation from investigate, or else from Latin investigator "he that searches into," agent noun from past participle stem of investigare "to trace out, search after" (see investigation). Related: Investigatorial.

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Definitions of investigator

investigator (n.)
a scientist who devotes himself to doing research;
Synonyms: research worker / researcher
investigator (n.)
someone who investigates;
investigator (n.)
a police officer who investigates crimes;
Synonyms: detective / tec / police detective
From wordnet.princeton.edu