intransitive verb. To observe or inquire into in detail; examine systematically.

intransitive verb. To make a detailed inquiry or systematic examination.

To search into or search out; inquire into; search or examine into the particulars of; examine in detail: as, to investigate the forces of nature; to investigate the causes of natural phenomena; to investigate the conduct of an agent.

Synonyms To scrutinize, overhaul, sift, probe into, explore, study.

intransitive verb. To pursue a course of investigation and study; to make investigation.

transitive verb. To follow up step by step by patient inquiry or observation; to trace or track mentally; to search into; to inquire and examine into with care and accuracy; to find out by careful inquisition.

verb. To inquire into or study in order to ascertain facts or information.

verb. To examine, look into, or scrutinize in order to discover something hidden or secret.

verb. To conduct an inquiry or examination.

verb. investigate scientifically

verb. conduct an inquiry or investigation of

"His object was, to investigate the causes of this Grecian superiority; or, if _investigate_ is too pompous a word for so slight a discussion, more properly, he inquired for the cause as something that must naturally lie upon the surface."

investigated  investigating  

common law  drug-related  enquiring  examine  fact-finding  

air  analyze  canvass  comment upon  consider  

investigated  investigates  investigating