in‧ves‧ti‧ga‧tion W2
1 [countable]SCP an official attempt to find out the truth about or the causes of something such as a crime, accident, or scientific problem:
The investigation continued for nearly three years.
investigation into
The authorities are planning to launch a full-scale investigation into the crash.
investigation of
Baker demanded an investigation of the district attorney's office.
A private detective was hired to conduct the investigation.
2 [uncountable] the act of investigating something
investigation of
the investigation of computer fraud
under investigation (=being investigated)
The whole issue is still under investigation.

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