I. ə-ˈkȯr-dē-ən noun
Etymology: German Akkordion, from Akkord chord, from French accord, from Old French acord
Date: 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 -dē-ə-nist noun
II. adjective
Date: 1884
: folding or creased or hinged to fold like an accordion
an accordion pleat
an accordion door