Who is a journalist?
“Bon jour,” say the French when greeting someone in the mornings: “Good day.” The Latin-derived French word is closest to the original Latin “diurnum” for “day.” In late Latin, “diurnalis” meant “journal,” a daily record. As the word migrated into late Middle English as “journal,” it meant a record for travelers of the daily stages of a trip, an itinerary of the “journey.” By the late 1500s, it evolved into any daily record and was applied to periodicals. In the late 1600s, “journalist” described a person who earned a living by writing or editing for a newspaper or periodical. In the 20th Century, it also described people working in broadcast news. All journalists provide a periodic record of events people want to, or need to, know.
--Oxford English Dictionary