extra Definition

extra
adj

1. Additional; more than is usual, necessary or expected.

Thesaurus: additional, supplemental, surplus, reserve, spare, leftover, extraneous, superfluous, inessential; Antonym: integral.
2. For which an additional charge is made.

noun extras

1. An additional or unexpected thing.

Thesaurus: addition, supplement, bonus, accessory, adjunct.
2a. An extra charge;
2b. An item for which this is made.
3. An actor employed temporarily in a small, usually non-speaking, part in a film.
4. A special edition of a newspaper containing later news.
5. cricket.
A run scored other than by hitting the ball with the bat.

adverb

1. Unusually or exceptionally.

Etymology: 17c: probably a shortening of extraordinary.