Definition of musica ficta in US English:

musica ficta

noun

Music
  • (in early contrapuntal music) the introduction by a performer of sharps, flats, or other accidentals to avoid unacceptable intervals.

    • ‘Two of the most famous authors of this period, Walter Odington and Philippe de Vitry, do not approach musica ficta from the standpoint of attraction accidentals.’
    • ‘That's what so-called ‘musica ficta’ threatens to do to Ockeghem, Busnoys, Josquin, and Gombert.’

Origin

Early 19th century: Latin, literally ‘feigned music’.

Pronunciation

musica ficta

/ˌmyo͞ozikə ˈfiktə/