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[fas-uhn, fah-suhn]
verb (used with object)
to attach firmly or securely in place; fix securely to something else.
to make secure, as an article of dress with buttons, clasps, etc., or a door with a lock, bolt, etc.
to enclose securely, as a person or an animal (usually followed by in ): to fasten a monkey in a cage.
to attach, associate, or connect: to fasten a nickname on someone.
to direct (the eyes, thoughts, etc.) intently: to fasten one's eyes on a speaker.
verb (used without object)
to become fast, fixed, or firm.
to close firmly or securely; lock: This clasp won't fasten.
to take a firm hold; seize (usually followed by on or upon ): to fasten on an idea.
to focus attention; concentrate (usually followed by on or upon ): His gaze fastened on the jewels.

before 900; Middle English fastenen, Old English fæstnian; cognate with Old Norse fastna to betroth; akin to fast1

refasten, verb (used with object)
well-fastened, adjective

1. connect, link, hook, clasp, clinch, rivet, clamp, bind, tie, tether.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fasten (ˈfɑːsən)
vb (usually foll by on) (usually foll by on or upon) (usually foll by on)
1.  to make or become fast or secure
2.  to make or become attached or joined
3.  to close or become closed by fixing firmly in place, locking, etc
4.  (tr; foll by in or up) to enclose or imprison
5.  to cause (blame, a nickname, etc) to be attached (to); place (on) or impute (to)
6.  to direct or be directed in a concentrated way; fix: he fastened his gaze on the girl
7.  take firm hold (of)
[Old English fæstnian; related to Old Norse fastna to pledge, Old High German fastinōn to make fast; see fast1]

fastening (ˈfɑːsənɪŋ)
something that fastens, such as a clasp or lock

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

O.E. fæstnian "make fast, firm," also "ratify, betroth," from P.Gmc. *fastinojanan, from *fastuz (see fast (adj.)). Related: Fastened; fastener; fastening.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The violent action of the mechanism reminded me of a spider's mouth fastening
  on prey.
Only bicycles with a single rivet fastening the cable stop to the frame are
  subject to recall.
For fastening fiber cement, use stainless-steel fasteners.
Lab fastening methods-various ways labs fastening seat cushions to test fixture
  were shown and described.
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