investigation
//ɪnˌvɛstɪˈɡeɪʃən//
Noun
investigationSingular
investigationsPlural
1
A systematic examination or inquiry to discover and examine facts, especially in order to establish the truth about something or to solve a problem.
The police launched an investigation into the accident.
2
The action of investigating something or someone; formal or systematic examination or research.
The investigation into the cause of the accident is still ongoing.