[fas-uh-ner, fah-suh-]
any of various devices for fastening.
any of various devices, as a snap or hook and eye, for holding together two objects or parts sometimes required to be separate, as two edges or flaps of a piece of clothing.
a worker who fastens things together.

1620–30; fasten + -er1

unfastener, noun 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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Impressed by the stickiness of the bur's hooks, he copied the design,
  engineering a two-piece fastener.
Fastener management and control pertains to the procurement, receiving
  inspection, and storage of fasteners.
The fastener has special usefulness in high temperature applications where high
  reliability is important.
Fastener size and hole size shall be specified on the engineering drawing.
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