Meaning

noun a portable box-shaped free-reed instrument; the reeds are made to vibrate by air from the bellows controlled by the player

originEtymology tree Vulgar Latin *accordāre Old French acorder Middle French accorder French accorderdeverb. French accordbor. German Akkord German -ion German Akkordeonbor. English accordion First attested in 1831. Borrowed from German Akkordeon, from Akkord (“harmony”), from French accord, from Old French acorder, based on Italian accordare (“to tune”). See also accord.

Etymology from Wiktionary, CC BY-SA 3.0