Origin of accordionGerman akkordion from akkord, harmony (prob. from Italian accordare, to be in tune: see accord) + -ion as in orchestrion
Origin of accordionGerman Akkordion from Akkord chord from French accord harmony from Old French acorder to accord from Medieval Latin accordāre to bring into agreement ; see accord .
(third-person singular simple present accordions, present participle accordioning, simple past and past participle accordioned)
- (intransitive) To fold up, in the manner of an accordion