To look into carefully in order to uncover (find) facts or information.
conduct an inquiry of; "The district attorney's office investigated reports of possible irregularities"
investigate scientifically: "Let's investigate the syntax of Chinese"
conduct an inquiry or investigation of; "The district attorney''s office investigated reports of possible irregularities"; "inquire into the disappearance of the rich old lady"
investigate scientifically; "Let''s investigate the syntax of Chinese"