[ac.cor.di.on] n [G Akkordion, fr. Akkord chord, fr. F accord, fr. OF acort] (1831): a portable keyboard wind instrument in which the wind is forced past free reeds by means of a hand-operated bellows -- ac.cor.di.on.ist n
[2]accordion adj (1885): folding or creased or hinged to fold like an accordion "an ~ pleat" "an ~ door"