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Definition of: investigation

(in·ves′tə·gā′shən) noun
1. The act of investigating; careful inquiry or research.
2. An inquiry by authority, as by a legislative committee, into certain facts.
3. A systematic examination of some scientific question, whether by experiment or mathematical treatment. [<F]

Most often used phrases:

criminal investigation
police investigation
accident investigation
scientific investigation
investigation found
investigation revealed
subsequent investigation
federal investigation
murder investigation
independent investigation
official investigation
investigation department
internal investigation
sockpuppet investigation
investigation team

'investigation' used in million biggest domains list by Alexa.com:

ptc-investigation.com
forum-ptc-investigation.com
hyipinvestigation.com
domesticinvestigations.org
celluliteinvestigation.com
ddinvestigations.com

'investigation' used in other domains:

hongkonginvestigations.com
auginvestigation.com
fredphillipsinvestigations.com
fpinvestigation.com
silentrunninginvestigations.com
francisinvestigations.com

Statistical data

"investigation" has the frequency of use of 0.002% on city-data.com forum

"investigation" has the frequency of use of 0.0042% on en.wikipedia.org.