Definition of an accordion:
A portable musical instrument of the free reed family, controlled by air flow from the bellows.
The accordion is known by many different names in different countries and has many relations, including:
Accordeon Acordeao Aeloine Aeolidicon Aerophone Accordian Akkordeon Armonica Armonica a Manticino Armonika Bayan Buzika Concertina Dragharmonika Dragspel Dragspil Drängkammarorgel Fisarmonica | Garmon Garmonik Garmonoshka Gombos Gombos Harmonika Handharmonika Handklaver Hanuri Harmonieflute Harmonika Klavier-Harmonika Lindanda Lootspill Melodeon Melodion Melophone Mello-Piano Organetto | Organo violine Orgue-Expressif Pedalowka Physarmonica Realejo Sanfona Schwyzerorgeli Seraphine Squeeze-Box Steirisch Sun Fin Chin Terodion Transichord Trekharmonika Trekkspil Trekzak Uranion Zieharmonika |