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.
Dictionary.com 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]

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.
Online Etymology Dictionary, © 2010 Douglas Harper
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