This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any of various precursors to the modern piano.

n. A keyboard instrument; the smaller, quieter, precursor to the pianoforte.

"The fortepiano timbre didn't reveal any new secrets in the solo portions — Bach's writing is still very much modeled on harpsichord/clavichord virtuosity — but when providing a rippling accompaniment to the whole ensemble, the softer, subtler touch made for an invitingly plush sound."