Salon, what is the origin of the word?

salon (n.) - 1690s, "large room or apartment in a palace or great house," from French salon "reception room" (17c.), from Italian salone "large hall," from sala "hall," from a Germanic source (compare Old English sele, Old Norse salr "hall," Old High German sal "hall, house," German Saal), from Proto-Germanic *salaz, from PIE *sel- (1) "human settlement" (source also of Old Church Slavonic selo "courtyard, village," obsolete Polish siolo, Russian selo "village," Lithuanian sala "village").

Sense of "reception room of a Parisian lady" is from 1810; meaning "gathering of fashionable people" first recorded 1888 (the woman who hosts one is a salonnière). Meaning "annual exhibition of contemporary paintings and sculpture in Paris" is from its originally being held in one of the salons of the Louvre. Meaning "establishment for hairdressing and beauty care" is from 1913.

Its French and means a room where people meet up and relax.

You can find out the origin of any word in a good dictionary. It's called the etymology of the word. Please learn how to use simple reference sources, kiddo.

French
reception room