noun Music.
Also called piano accordion. a portable wind instrument having a large bellows for forcing air through small metal reeds, a keyboard for the right hand, and buttons for sounding single bass notes or chords for the left hand.
a similar instrument having single-note buttons instead of a keyboard.
having a fold or folds like the bellows of an accordion: accordion roof; accordion panel.
verb (used without object)
(of a door, roof, or other covering) to open by folding back or pressing together in the manner of an accordion: The roof of the car accordions to let in sunlight and fresh air.
to fold, crush together, or collapse in the manner of an accordion.
verb (used with object)
to demolish by crushing together lengthwise: The impact accordioned the car beneath the truck.

1831; < German, now spelling Akkordion, Akkordeon name under which the instrument was patented in Vienna in 1829; probably < French accord(er) or Italian accord(are) to harmonize (see accord) + French -ion -ion, as in German Orchestrion orchestrion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
accordion (əˈkɔːdɪən)
1.  a portable box-shaped instrument of the reed organ family, consisting of metallic reeds that are made to vibrate by air from a set of bellows controlled by the player's hands. Notes are produced by means of studlike keys
2.  short for piano accordion
[C19: from German Akkordion,from Akkord harmony, chord]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1831, from Ger. Akkordion, from Akkord "musical chord, concord of sounds, be in tune" (cf. It. accordare "to attune an instrument"); ult. from same source as Eng. accord (q.v.) + suffix on analogy of clarion, etc. Invented 1829 by piano-maker Cyrill Demian (1772-1847) of Vienna.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There is a so-called musical instrument which is variously known as the
  accordion, the concertina, or the harmonica.
Their favored musical instrument is the accordion, their national dance a form
  of polka.
Her first instrument was a toy accordion that her brother broke by accidentally
  stepping on it.
Extended improvised solos are generally performed on guitar and/or violin but
  clarinet and accordion are also gaining adherents.
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