Mezzo-soprano

[Sarah]

Having a medium compass between the soprano and contralto; --said of the voice of a female singer.-- n.(a) A mezzo-soprano voice.(b) A person having such a voice.

[Sarah]

The medium female [singing] voice in [opera] and non-[classic]al [music] (although in the [choir], the mezzo-soprano and the [contralto] are lumped together as [alto]s). The mezzo-soprano has a range of two [octave]s from A3 (below [middle C]) to A5 (just two notes short of [high C]). This is the most common female voice.
Situated between the [soprano] and contralto, the mezzo-soprano typically plays supporting roles (mothers, [maidservant]s, friends of the [heroine]) as well as [villain]ous women like the [femme fatale] (the saying among mezzo-sopranos and contraltos is that they play witches,

[Sarah]

What most female singer are. Seriously.
If one is a soprano, they can hit A 5 with no trouble at all.
If one is a full-soprano, they can hit C 5 with no trouble at all.
If one is a contralto, they can hit C2 with no trouble at all.