verb (used with object)
to fasten or affix; join; connect: to attach a photograph to an application with a staple.
to join in action or function; make part of: to attach oneself to a group.
Military. to place on temporary duty with or in assistance to a military unit.
to include as a quality or condition of something: One proviso is attached to this legacy.
to assign or attribute: to attach significance to a gesture.
to bind by ties of affection or regard: You always attach yourself to people who end up hurting you.
Law. to take (persons or property) by legal authority.
Obsolete. to lay hold of; seize.
verb (used without object)
to adhere; pertain; belong (usually followed by to or upon ): No blame attaches to him.

1300–50; Middle English atachen < Anglo-French atacher to seize, Old French atachier to fasten, alteration of estachier to fasten with or to a stake, equivalent to estach(e) (< Germanic *stakka stake) + -ier infinitive suffix

attachable, adjective
attacher, noun
reattach, verb
reattachable, adjective
unattachable, adjective

attach, attaché.

1. subjoin, append, add, annex.

1. detach. Unabridged


[a-ta-shey, at-uh- or, esp. British, uh-tash-ey]
a diplomatic official attached to an embassy or legation, especially in a technical capacity: a commercial attaché; a cultural attaché.
a military officer who is assigned to a diplomatic post in a foreign country in order to gather military information: an air attaché; an army attaché; a naval attaché.
Also, attache. attaché case.

1825–35; < French: literally, attached, past participle of attacher to attach

attach, attaché. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
attach (əˈtætʃ)
vb (foll by to)
1.  to join, fasten, or connect
2.  (reflexive or passive) to become associated with or join, as in a business or other venture: he attached himself to the expedition
3.  to be inherent (in) or connected (with): responsibility attaches to the job
4.  to attribute or ascribe: to attach importance to an event
5.  to include or append, esp as a condition: a proviso is attached to the contract
6.  (usually passive) military to place on temporary duty with another unit
7.  (usually passive) to put (a member of an organization) to work in a different unit or agency, either with an expectation of reverting to, or while retaining some part of, the original working arrangement
8.  to appoint officially
9.  law to arrest or take (a person, property, etc) with lawful authority
10.  obsolete to seize
[C14: from Old French atachier to fasten, changed from estachier to fasten with a stake, from estachestake1]

attaché (əˈtæʃeɪ, French ataʃe)
1.  a specialist attached to a diplomatic mission: military attaché
2.  (Brit) a junior member of the staff of an embassy or legation
[C19: from French: someone attached (to a mission), from attacher to attach]

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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Word Origin & History

early 14c., "to take or seize (property or goods) by law," a legal term, from O.Fr. estachier "to attach" (Fr. attacher, It. attaccare), perhaps from a- "to" + Frank. *stakon "a post, stake" or a similar Gmc. word (see stake (n.)). Meaning "to fasten, affix, connect" is first
attested 1802, from French.

1835, from Fr. attaché "junior officer attached to the staff of an ambassador, etc.," lit. "attached," pp. of attacher "to attach" (see attach). Attache case "small leather case for carrying papers" first recorded 1904.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
attaché [(a-ta-shay, at-uh-shay)]

A diplomatic officer attached to an embassy or consulate. Most attachés have specialties, such as military attachés, cultural attachés, economic attachés, and so forth.

Note: Some nations disguise spies as attachés.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
If any blame or fault attaches to the attempt it is mine alone.
Fashion the receptacle with a bottom that attaches onto the garbage disposal of
  a sink.
Thus they lose the sacred character that attaches to the struggle of the
  oppressed against oppressors.
The skin attaches to the predator and warns other creatures of its presence.
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