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ef-

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ef-

var. of ex- 1 (by assimilation) before f: efficient.

ex-

1
a prefix meaning “out of,” “from,” and hence “utterly,” “thoroughly,” and sometimes imparting a privative or negative force or indicating a former title, status, etc.; freely used as an English formative: exstipulate; exterritorial; ex-president (former president); ex-member; ex-wife.
Also, e-, ef-.


Origin:
< L, comb. form of ex, ē (prep.) out (of), from, beyond
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Word Origin & History

ex- 
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, © 2001 Douglas Harper
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Legal Dictionary

Main Entry: ex-
Function: prefix
Etymology: Latin ex from, out of
: free from : without
Merriam-Webster's Dictionary of Law, © 1996 Merriam-Webster, Inc.
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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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