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Accordions refer to a family of box-shaped musical instruments of the bellows-driven free-reed aerophone type, colloquially referred to as a squeezebox. (source: wikipedia)
This definition is highly relevant because it highlights a number of key aspects:
The accordion family includes an array of different instruments (e.g. concertina, bandoneon, harmonium, American reed organ), with the accordion alone consisting of several types (e.g. chromatic, diatonic, standard or free bass)