What is Investigate?

Investigate definition and meaning on Dictionary terms:
verb (used with object), inA.vesA.tiA.gatA.ed,
to examine, study, or inquire into systematically; search or examine into the particulars of; examine in detail.
to search out and examine the particulars of in an attempt to learn the facts about something hidden, unique, or complex, especially in an attempt to find a motive, cause, or culprit: The police are investigating the murder.

verb (used without object), inA.vesA.tiA.gatA.ed,
to make inquiry, examination, or investigation.