ex·tra (ĕk'strə)
adj.

1. More than or beyond what is usual, normal, expected, or necessary. See synonyms at superfluous.
2. Better than ordinary; superior: extra fineness.
3. Subject to an additional charge: Coffee does not come with dinner but is extra.

n.

1. Something more than is usual or necessary.
2. Something, such as an accessory on a motor vehicle, for which an additional charge is made.
3. A special edition of a newspaper.
4. 1. An additional or alternate worker.
   2. A performer hired to play a minor part, as in a crowd scene in a film.
5. Something of exceptional quality.

adv.
To an exceptional extent or degree; unusually: extra dry.

[Probably short for EXTRAORDINARY.]

---

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

---