A musical note, two octaves above middle C, at or near the upper limit of a soprano's vocal range; also the note an octave below this similarly at or near the upper limit of a tenor's vocal range; sometimes (in extended use) as the type of a very high note.
Origin
Mid 19th century; earliest use found in The Musical World.
Definition of high C in US English:
high C
noun
Music
A musical note, two octaves above middle C, at or near the upper limit of a soprano's vocal range; also the note an octave below this similarly at or near the upper limit of a tenor's vocal range; sometimes (in extended use) as the type of a very high note.
Origin
Mid 19th century; earliest use found in The Musical World.