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Noun investigation has 2 senses
probe, investigation - an inquiry into unfamiliar or questionable activities; "there was a congressional probe into the scandal"--1 is a kind of inquiry, enquiry, research
 
investigation, investigating - the work of inquiring into something thoroughly and systematically--2 is a kind of work
 --2 has particulars:
 |  | analysis; count, counting, numeration, enumeration, reckoning, tally; police work, police investigation; empiricism; examination, scrutiny; examination, testing; inquiry, enquiry; research; search; tabulation; wiretap, tap | 
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