ex·tra

[ek-struh]
adjective
1.
beyond or more than what is usual, expected, or necessary; additional: an extra copy of a newspaper; an extra charge.
2.
larger or better than what is usual: an extra binding.
noun
3.
something extra or additional: the little amenities and extras that make life pleasant.
4.
an additional expense.
5.
a special edition of a newspaper, other than a regular edition.
6.
something of superior quality.
7.
Movies, Television. a person hired by the day to play a minor part, as a member of a mob or crowd.
8.
an additional worker.
9.
Usually, extras. Cricket. a score or run not made from the bat, as a bye or a wide.
00:10
Extra is always a great word to know.
So is bezoar. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
adverb
10.
in excess of the usual or specified amount: an extra high price.
11.
beyond the ordinary degree; unusually; uncommonly: done extra well; extra large.

Origin:
1770–80; by shortening of extraordinary

Dictionary.com Unabridged

extra-

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


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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
extra (ˈɛkstrə) [Click for IPA pronunciation guide]
 
adj
1.  being more than what is usual or expected; additional
 
n
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
 
adv
8.  unusually; exceptionally: an extra fast car
 
[C18: perhaps shortened from extraordinary]

extra-
 
prefix
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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Etymonline
Word Origin & History

extra
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-
pref.
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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FOLDOC
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
Premium-price speakers will charge extra to attend faculty luncheons or
  receptions, and must have access to a helipad.
The average extra loss was then used to rank the five price frames.
At the same time, the extra sunlight causes more evaporation off the ocean,
  which adds to downpours in the western tropics.
To give his bots an extra boost, he's turning to call-center data.
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