Definition of "reporter"

Someone or something that reports.  examples

A journalist who investigates, edits and reports news stories for newspapers, radio and television.  examples

A person who records and issues official reports of judicial or legislative proceedings.  examples

(law) A case reporter; a bound volume of printed legal opinions from a particular jurisdiction.  examples

(biology) A gene attached by a researcher to a regulatory sequence of another gene of interest, typically used as an indication of whether a certain gene has been taken up by or expressed in the cell or organism population.