Definition of semibreve in US English:

semibreve

noun

British
Music
  • A note having the time value of two half notes or four quarter notes, represented by a ring with no stem. It is the longest note now in common use.

    Also called whole note
    • ‘For the first time the minim is now fully accepted as a note-value in its own right rather than as a special kind of semibreve.’
    • ‘The theme, an eight-bar structure of stentorian semibreve piano chords, receives six doggedly unvaried statements.’
    • ‘The cantus firmus is sounded in semibreves in the middle of the three voices.’

Pronunciation

semibreve

/ˈsɛmiˌbriv//ˈsemēˌbrēv/