semibreve

A whole note in music.

In music, a whole note, or the space of time measured by it. See note, 13.

A note of half the time or duration of the breve; — now usually called a whole note. It is the longest note in general use.

A musical note four beats long in 4/4 time; a whole note (US)

a musical note having the longest time value (equal to four beats in common time)