[v. uh-neks, an-eks; n. an-eks, -iks]
verb (used with object)
to attach, append, or add, especially to something larger or more important.
to incorporate (territory) into the domain of a city, country, or state: Germany annexed part of Czechoslovakia.
to take or appropriate, especially without permission.
to attach as an attribute, condition, or consequence.
noun Also, especially British, annexe.
something annexed.
a subsidiary building or an addition to a building: The emergency room is in the annex of the main building.
something added to a document; appendix; supplement: an annex to a treaty.

1350–1400; (v.) Middle English < Anglo-French, Old French annexer < Medieval Latin annexāre, derivative of Latin annexus tied to, past participle of annectere (see annectent); (noun) < French annexe or noun use of v.

annexable, adjective
nonannexable, adjective
preannex, verb (used with object)
reannex, verb (used with object)
unannexable, adjective
unannexed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  to join or add, esp to something larger; attach
2.  to add (territory) by conquest or occupation
3.  to add or append as a condition, warranty, etc
4.  to appropriate without permission
5.  a variant spelling (esp US) of annexe
[C14: from Medieval Latin annexāre, from Latin annectere to attach to, from nectere to join]

annexe or esp (US) annex (ˈænɛks)
1.  a.  an extension to a main building
 b.  a building used as an addition to a main building nearby
2.  something added or annexed, esp a supplement to a document
annex or esp (US) annex

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  annex
Part of Speech:  n
Definition:  See annexure's 21st Century Lexicon
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Word Origin & History

late 14c., from O.Fr. annexer "to join" (13c.), from M.L. annexare, freq. of L. annecetere "to bind to," from ad- "to" + nectere "to tie, bind" (see nexus). Almost always meaning "to join in a subordinate capacity." Of nations or territories, c.1500. The noun sense of "supplementary
building" is attested from 1861, from Fr. annexe.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Space will be converted to a used book annex.
Peek in the annex, where the individual collections are organized .
The complex included a bar, a restaurant and some annex rooms for privacy.
These were appended to the original legislation in an annex.
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