Extra

[ek-struh] /ˈɛk strə/

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.
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.
1.
a prefix meaning “outside,” “beyond,” freely used as an English formative:
extrajudicial; extraterritorial; extra-atmospheric.
[ahb ek-strah; English ab ek-struh] /ɑb ˈɛk strɑ; English æb ˈɛk strə/
adverb, Latin.
1.
from the outside.
/ˈɛkstrə/
adjective
1.
being more than what is usual or expected; additional
noun
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
adverb
8.
unusually; exceptionally: an extra fast car
prefix
1.
outside or beyond an area or scope: extrasensory, extraterritorial

1650s as a stand-alone adjective; also used as an adverb and noun in 17c. (see extra-); 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.

only recorded in classical Latin in extraordinarius, but much used in Medieval Latin and modern formations; it represents Latin extra (adv.) “on the outside, without, except,” the old fem. ablative singular of exterus “outward, outside,” comparative of ex “out of” (see ex-).

extra- or extro-
pref.
Outside; beyond: extracellular.

noun

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).