(music, voice) A note extremely high in the register, but not falsetto.

In diplomacy, an unsigned memorandum calling attention to a neglected, though perhaps not urgent, matter.

The first note of a diatonic scale; the keynote, the tonic.

A notation used in music that increases the duration of the basic note by half of its original value.

(UK) A note issued by a doctor, indicating whether the patient is fit to work and under what conditions.

(diplomacy) A formal piece of diplomatic correspondence signed by the representatives of several governments addressed to one or more other governments.

(music) The highest and usually climactic note of a song or composition, especially one that is difficult to reach. / (figuratively) A climax or best achievement.

(idiomatic) A negative aspect to something mostly positive.

(rare) A suicide note; a message written prior to a suicide attempt.

(music, US) a note with 1/32 the length of a whole note