semibreve

[sem-ee-breev, -brev, sem-ahy-] /ˈsɛm iˌbriv, -ˌbrɛv, ˈsɛm aɪ-/
noun, Music (chiefly British)
1.
a note half the length of a breve; whole note.
Origin
1585-95; semi- + breve
British Dictionary definitions for semibreve

semibreve

/ˈsɛmɪˌbriːv/
noun
1.
(music) a note, now the longest in common use, having a time value that may be divided by any power of 2 to give all other notes Usual US and Canadian name whole note See also breve (sense 2)