accordion

American  

[uh-kawr-dee-uhn] / əˈkɔr di ən /

noun

Music.

1. 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.

2. a similar instrument having single-note buttons instead of a keyboard.

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adjective

1. having a fold or folds like the bellows of an accordion.

   accordion roof; accordion panel.

verb (used without object)

1. (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.

2. to fold, crush together, or collapse in the manner of an accordion.

verb (used with object)

1. to demolish by crushing together lengthwise.

   The impact accordioned the car beneath the truck.

accordion British  

/ əˈkɔːdɪən /

noun

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

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Other Word Forms

• accordionist
  noun

Etymology

Origin of accordion

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

Explanation

An accordion is a hand-held musical instrument that has a keyboard or buttons and a bellows that blows air in and out. A street musician might play folk tunes on her accordion and collect donations in a hat. One of the distinct features of an accordion is its bellows, which looks like a series of pleats at the center of the instrument, and which allows the player to push and pull the accordion as she plays, blowing air across reeds inside it. The accordion was invented in the early 1800s, and it's played in many countries around the world. The word comes from the German Akkordion, from Akkord, "musical chord" or "be in tune."

Example Sentences

Wilson believes that Snow Secure—the high-tech insulated polystyrene blanket that unfolds like an accordion, then drapes over a pile of snow—is just the invention.

From Slate • Apr. 11, 2026

The company also closed a revolving credit facility of up to $200 million, with an additional accordion option of up to $50 million.

From Barron's • Mar. 25, 2026

It's like a wing with a flexible, corrugated structure within it – something like an accordion – that allows said wing to fold down quickly, or flex with ease.

From BBC • Mar. 3, 2026

Murals on side streets depict women cooking tortillas on a comal and musicians playing guitar and accordion.

From Los Angeles Times • Feb. 6, 2026

Emily and James sat side by side in the accordion section of an extra-long city bus on their way to the Black Cat restaurant.

From "Book Scavenger" by Jennifer Chambliss Bertman