I. (ˈ)fȯ(r)|tisəˌmō adverb (or adjective)
Etymology: Italian, from Latin fortissimus, superl. of fortis — more at fort
: very loud — used as a direction in music; abbr. ff
II. noun
( plural fortissimos -ˌmōz ; or fortissi·mi -ˌmē)
Etymology: Italian, from fortissimo, adjective
: a very loud passage, sound, or tone