4 [eks]
adjective Slang.
excellent ( def 1 ).

by shortening

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ex1 (ɛks)
1.  finance not participating in; excluding; without: ex bonus; ex dividend; ex rights
2.  commerce without charge to the buyer until removed from: ex quay; ex ship; ex works
[C19: from Latin: out of, from]

ex2 (ɛks)
1.  informal (a person's) former wife, husband, etc
2.  (Canadian) short for exhibition

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

prefix, in Eng. meaning mainly "out of, from," but also "upwards, completely, deprive of, without," and "former;" from L. ex "out of," from PIE *eghs "out" (cf. Gaul. ex-, O.Ir. ess-, O.C.S. izu, Rus. iz). In some cases also from Gk. cognate ex, ek. It has stood on its own since 1929 as abbreviation
for ex-wife, ex-husband, etc.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ex- pref.
Outside; out of; away from: excementosis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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