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1. The act or process of investigating: a politician under investigation.
2. A careful examination or search in order to discover facts or gain information. See Synonyms at inquiry.

in·ves′ti·ga′tion·al adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


the act or process of investigating; a careful search or examination in order to discover facts, etc
inˌvestiˈgational adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ɪnˌvɛs tɪˈgeɪ ʃən)

1. the act or process of investigating or the condition of being investigated.
2. a searching inquiry for ascertaining facts; detailed or careful examination.
[1400–50; late Middle English < Latin]
in•ves`ti•ga′tion•al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.



fishing expedition An investigation conducted without definite purpose, plan, or regard to standards of propriety, in hopes of acquiring useful (and usually incriminating) evidence or information; apparently aimless interrogation designed to lead someone into incriminating himself. This expression refers to the literal fishing expedition in which, armed with basic equipment, one goes after his prey without knowing exactly what, if anything, he will catch. The more skillful and experienced the fisherman, though, the better are his chances of successfully catching his quarry.

I am not going to permit counsel to go on a fishing expedition. (Erie Stanley Gardner, The Case of the Bigamous Spouse, 1961)

go over with a fine-tooth comb see THOROUGHNESS.

leave no stone unturned See THOROUGHNESS.

shakedown A thorough search, as of a prison cell in hopes of finding hidden weapons or other contraband. This expression alludes to shaking a tree to expose and acquire fruits or nuts which might be hidden within the foliage, and implies that something is turned upside-down and shaken to reveal the desired items. The expression is often used as a verb, to shake down.

A couple of patrolmen to shake down the neighborhood … (Richard Starnes, And When She Was Bad She Was Murdered, 1951)

As an adjective, shake-down is often applied to a cruise or flight undertaken to expose any mechanical flaws and to orient the crew while breaking in and adjusting the new equipment. See also shakedown, EXTORTION.

take soundings To investigate, to try to find out what is going on or how things stand; to psych out a situation. To take soundings is literally to measure the depth of water by letting down a line with a lead attached to the bottom. Figurative use of sounding appeared in print during the time of Shakespeare.

Old Dan bears you no malice, I’d lay fifty pounds on it! But, if you like, I’ll just step in and take soundings. (Charles J. Lever, The Martins of Cro’ Martin, 1856)

the third degree Intensive, prolonged interrogation, often in conjunction with physical abuse, to obtain information or force a confession. Usually used in the context of a prisoner’s being questioned by the police, third degree refers to the severity of the techniques employed. Just as a third-degree burn is the most damaging and extreme type of burn, so is a “third degree” the most drastic form of interrogation.

He was at first arrested merely as a suspicious person, but when put through the “third degree” at the station, admitted that he entered the house last night. (New York Times, July 6, 1904)

Picturesque Expressions: A Thematic Dictionary, 1st Edition. © 1980 The Gale Group, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.investigation - an inquiry into unfamiliar or questionable activitiesinvestigation - an inquiry into unfamiliar or questionable activities; "there was a congressional probe into the scandal"
inquiry, research, enquiry - a search for knowledge; "their pottery deserves more research than it has received"
fishing expedition - an investigation undertaken in the hope (but not the stated purpose) of discovering information
2.investigation - the work of inquiring into something thoroughly and systematicallyinvestigation - the work of inquiring into something thoroughly and systematically
work - activity directed toward making or doing something; "she checked several points needing further work"
analysis - an investigation of the component parts of a whole and their relations in making up the whole
counting, enumeration, numeration, count, reckoning, tally - the act of counting; reciting numbers in ascending order; "the counting continued for several hours"
police investigation, police work - the investigation of criminal activities
empiricism - the application of empirical methods in any art or science
examination, scrutiny - the act of examining something closely (as for mistakes)
testing, examination - the act of giving students or candidates a test (as by questions) to determine what they know or have learned
enquiry, inquiry - a systematic investigation of a matter of public interest
research - systematic investigation to establish facts
search - an investigation seeking answers; "a thorough search of the ledgers revealed nothing"; "the outcome justified the search"
tabulation - the act of putting into tabular form; "the tabulation of the results"
wiretap, tap - the act of tapping a telephone or telegraph line to get information
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


noun examination, study, inquiry, hearing, research, review, search, survey, analysis, probe, inspection, exploration, scrutiny, inquest, fact finding, recce (slang) He ordered an investigation into the affair.
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002


1. The act or an instance of exploring or investigating:
2. A seeking of knowledge, data, or the truth about something:
3. A close or systematic study:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
sự điều tra


[ɪnˌvestɪˈgeɪʃən] N
1. (= inquiry) (by police, authorities, scientist) → investigación f
the investigation into the causes of the accidentla investigación sobre las causas del accidente
these allegations need further investigationestas acusaciones se tienen que investigar más a fondo
2. (= inspection, search) [of place, site] → inspección f; [of document] → examen m (Med) → exploración f
doctors carried out a simple investigation under local anaestheticlos médicos realizaron una simple exploración utilizando anestesia local
3. (= in-depth study) → estudio m (of, into de)
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


[ɪnˌvɛstɪˈgeɪʃən] n
(into event, cause)enquête f
an investigation into sth → un enquête sur qch
He ordered an investigation into the affair → Il a ordonné une enquête sur cette affaire.
Investigations are continuing into the cause of his death
BUT Les investigations sur la cause de sa mort continuent.
[crime] → enquête f
the police investigation into his false alibi → l'enquête de police sur son faux alibi
to be under investigation for sth [person] → être sous le coup d'une enquête pour qch
He is under investigation for corruption → Il est sous le coup d'une enquête pour corruption.
Collins English/French Electronic Resource. © HarperCollins Publishers 2005


(to determine cause) → Untersuchung f (→ into +gen); (= official inquiry)Ermittlung f, → Untersuchung f; to call for an immediate investigation into somethingdie sofortige Untersuchung einer Sache (gen)fordern; to order an investigation into or of somethinganordnen, dass in einer Sache (dat)ermittelt wird; on investigation it turned out that …bei näherer Untersuchung stellte (es) sich heraus, dass …
(= looking for sth)Nachforschung f; (by police) → Ermittlungen pl; (of affairs, applicants, political beliefs etc)Überprüfung f; to be under investigationüberprüft werden; he is under investigation (by police) → gegen ihn wird ermittelt; new methods of criminal investigationneue polizeiliche Ermittlungsmethoden; (private) investigation agencyDetektei f, → Detektivbüro nt
(= scientific research) (in field) → Forschung f; (of bacteria, object etc)Erforschung f (→ into +gen); recent scientific investigation has shown …die neuesten wissenschaftlichen Untersuchungen haben gezeigt
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


[ɪnˌvɛstɪˈgeɪʃn] n (of crime) → indagine f, investigazione f giudiziaria
police investigations → le indagini della polizia
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995


(inˈvestigeit) verb
to examine or inquire into carefully. The police are investigating the mystery.
inˌvestiˈgation noun
inˈvestigator noun
a person, eg a detective, who investigates.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.


تَـحْقِيقٌ vyšetřování undersøgelse Untersuchung διερεύνηση investigación tutkimus investigation istraga indagine 調査 조사 onderzoek utredelse dochodzenie investigação расследование undersökning การสืบสวน soruşturma sự điều tra 侦查
Multilingual Translator © HarperCollins Publishers 2009


n. investigación, indagación.
English-Spanish Medical Dictionary © Farlex 2012
References in classic literature ?
"And to tell you the truth, my young friend, I am half inclined to think that when he is given to understand, as he will be by you, if he doesn't know it already, that I am in charge of the investigations concerning these two murders, he will see me."
Lastly, the investigations were to end in discovering whether there was any female relative, or any woman exercising domestic authority in the house, who was known to have an influence over either father or son.
The Procurator-Fiscal--being the person officially appointed to direct the preliminary investigations of the law--was the first witness called on the second day of the Trial.
It was not for him to anticipate what Professor Summerlee, who was the spokesman of the committee, had to say to them, but it was common rumor that their expedition had been crowned by extraordinary success.' (Applause.) `Apparently the age of romance was not dead, and there was common ground upon which the wildest imaginings of the novelist could meet the actual scientific investigations of the searcher for truth.
Now, I consider that the phrenologists have omitted an important thing in not pushing their investigations from the cerebellum through the spinal canal.
Hence, after fruitless attempts to suppress such investigations indirectly by making them liable to a heavy tax, the Legislature, in comparatively recent times, absolutely prohibited them.
But I found it difficult to get to work upon my abstract investigations.
At the same time, their boxes must be searched again--for this plain reason, that the first investigation only looked for the Diamond, and that the second investigation must look for the stained dress.
(if the discovery encouraged further investigation) to find out next the manner in which Mr.
Emotions are traditionally regarded by psychologists as a separate class of mental occurrences: I am, of course, not concerned to deny the obvious fact that they have characteristics which make a special investigation of them necessary.
But the investigation of these differences belongs also to metrical science.
From the records of the Colonial Office and from the dead man's diary we learn that a certain young English nobleman, whom we shall call John Clayton, Lord Greystoke, was commissioned to make a peculiarly delicate investigation of conditions in a British West Coast African Colony from whose simple native inhabitants another European power was known to be recruiting soldiers for its native army, which it used solely for the forcible collection of rubber and ivory from the savage tribes along the Congo and the Aruwimi.

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