Definition of accordion

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ac·cor·di·on    (-kôrd-n) KEY 

NOUN:

A portable wind instrument with a small keyboard and free metal reeds that sound when air is forced past them by pleated bellows operated by the player.

ADJECTIVE:

Having folds or bends like the bellows of an accordion: accordion pleats; accordion blinds.

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ETYMOLOGY:
German Akkordion, from Akkord, chord, from French accord, harmony, from Old French acorder, to accord, from Medieval Latin accordre, to bring into agreement ; see accord

OTHER FORMS:
ac·cordi·on·ist(Noun)