fortepiano Syllabification: (for·te·pi·an·o)Pronunciation: /ˌfôrtāpēˈanō, -pēˈänō/Definition of fortepiano noun (plural fortepianos) Music a piano, especially of the kind made in the 18th and early 19th centuries. Origin: mid 18th century: from forte2 + piano2fortepiano in other Oxford dictionaries Definition of fortepiano in the British & World English dictionary