investigation
US /ɪnˌves.təˈɡeɪ.ʃən/
UK /ɪnˌves.təˈɡeɪ.ʃən/
1.
the action of investigating something or someone; formal or systematic examination or research.
:
•
The police launched an investigation into the robbery.
•
A thorough investigation revealed the cause of the problem.