beyond or more than what is usual, expected, or necessary; additional: an extra copy of a newspaper; an extra charge.
larger or better than what is usual: an extra binding.
something extra or additional: the little amenities and extras that make life pleasant.
an additional expense.
a special edition of a newspaper, other than a regular edition.
something of superior quality.
Movies, Television. a person hired by the day to play a minor part, as a member of a mob or crowd.
an additional worker.
Usually, extras. Cricket. a score or run not made from the bat, as a bye or a wide.
in excess of the usual or specified amount: an extra high price.
beyond the ordinary degree; unusually; uncommonly: done extra well; extra large.

1770–80; by shortening of extraordinary

Dictionary.com Unabridged


a prefix meaning “outside,” “beyond,” freely used as an English formative: extrajudicial; extraterritorial; extra-atmospheric.
Also, extro-.

< Latin, combining form of extrā (adv. and preposition) outside (of), without

ab extra

[ahb ek-strah; English ab ek-struh]
adverb Latin.
from the outside.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
extra (ˈɛkstrə)
1.  being more than what is usual or expected; additional
2.  a person or thing that is additional
3.  something for which an additional charge is made: the new car had many extras
4.  an additional edition of a newspaper, esp to report a new development or crisis
5.  films an actor or person temporarily engaged, usually for crowd scenes
6.  cricket a run not scored from the bat, such as a wide, no-ball, bye, or leg bye
7.  (US) something that is better than usual in quality
8.  unusually; exceptionally: an extra fast car
[C18: perhaps shortened from extraordinary]

outside or beyond an area or scope: extrasensory; extraterritorial
[from Latin extrā outside, beyond, changed from extera, from exterus outward]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1650s as a stand-alone; modern usages -- including sense of "minor performer in a play" (1777) and "special edition of a newspaper" (1793) -- all probably are from shortenings of extraordinary, which was used extensively in 18c. as noun and adverb in places we would
use extra today. The prefix extra- was only recorded in classical L. in extraordinarius, but has been much used in modern formations such as extraterrestrial, and represents the old fem. abl. of exterus "outward, outside."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

extra- or extro-
Outside; beyond: extracellular.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

EXTRA definition

Object-oriented, Pascal style, handles sets. "A Data Model and Query Language for EXODUS", M.J. Carey et al, SIGMOD 88 Conf Proc, pp.413- 423, ACM SIGMOD Record 17:3 (Sept 1988).

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Allowing students to keep extra funding will improve time-to-degree.
Extra years of schooling and wider access to university are everywhere supposed
  to be good for growth.
Numerous extra or increased dividends were announced by domestic corporations
Here are some other majors that get extra credit for originality.
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