from
The Collaborative International Dictionary of English v.0.48
Extra \Ex"tra\, n.; pl. {Extras}.
1. Something in addition to what is due, expected, or
customary; esp., an added charge or fee, or something for
which an additional charge is made; as, at some hotels air
conditioning is an extra.
[Webster 1913 Suppl.]
2. An edition of a newspaper issued at a time other than the
regular one.
[Webster 1913 Suppl.]
3. (Cricket) A run, as from a bye, credited to the general
score but not made from a hit.
[Webster 1913 Suppl.]
4. Something of an extra quality or grade.
[Webster 1913 Suppl.]