a person or thing that binds.
a detachable cover, resembling the cover of a notebook or book, with clasps or rings for holding loose papers together: a three-ring binder.
a person who binds books; a bookbinder.
Insurance. an agreement by which property or liability coverage is granted pending issuance of a policy.
an attachment to a harvester or reaper for binding the cut grain.
Also called self-binder. a machine that cuts and binds grain.
Chemistry. any substance that causes the components of a mixture to cohere.
Painting. a vehicle in which pigment is suspended.
(in powder metallurgy) a substance for holding compacted metal powder together while it is being sintered.
Building Trades.
a stone, as a perpend, for bonding masonry.
a girder supporting the ends of two sets of floor joists.
a material for holding loose material together, as in a macadamized road.
stirrup ( def 4 ).
British, Australian Slang. a large quantity, especially of food.

before 1000; Middle English, Old English; see bind, -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
binder (ˈbaɪndə)
1.  a firm cover or folder with rings or clasps for holding loose sheets of paper together
2.  a material used to bind separate particles together, give an appropriate consistency, or facilitate adhesion to a surface
3.  a.  a person who binds books; bookbinder
 b.  a machine that is used to bind books
4.  something used to fasten or tie, such as rope or twine
5.  informal (NZ) a square meal
6.  obsolete Compare combine harvester Also called: reaper binder a machine for cutting grain and binding it into bundles or sheaves
7.  an informal agreement giving insurance coverage pending formal issue of a policy
8.  a tie, beam, or girder, used to support floor joists
9.  a stone for binding masonry; bondstone
10.  the nonvolatile component of the organic media in which pigments are dispersed in paint
11.  Compare linker (in systemic grammar) a word that introduces a bound clause; a subordinating conjunction or a relative pronoun

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. bindere "one who binds" (see bind). Of various things that bind, from early 16c.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

binder bind·er (bīn'dər)
A broad bandage, especially one encircling the abdomen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


machine for cutting grain and binding it into bundles, once widely used to cut small grain such as wheat. The first patent was issued on a self-tie binder in 1850. The horse-drawn twine binder, first marketed in 1880, remained the chief method of harvesting small grain during the early decades of the 20th century. The mechanical twine knotter was patented in 1892 in the United States. Along with the header, which cut off the heads of grain and elevated them into a wagon for later threshing, the binder was standard harvesting equipment in the wheat-producing areas of the United States and Canada until the grain combine was adopted in the 1930s. Binders, using twine, not wire, were still used in the late 20th century to a limited extent on small farms.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The report is written on lined notebook paper and clipped into a weathered
  three-ring binder.
It became a ritual for those of us who got jobs to donate to the binder.
There is also a student version which has holes that let you keep it in a
Otis suggests placing a laptop on a three-ring binder or other object to raise
  it up.
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