the act of linking; state or manner of being linked.
a system of links.
Genetics. an association between two or more genes on a chromosome that tends to cause the characteristics determined by these genes to be inherited as an inseparable unit.
Machinery. an assembly of four or more rods for transmitting motion, usually in the same plane or in parallel planes.
a factor or relationship that connects or ties one thing to another; link: Administration officials sought to establish linkage between grain sales and relaxed immigration laws.
any of various mathematical or drawing devices consisting of a combination of bars or pieces pivoted together so as to turn about one another, usually in parallel planes.
Electricity, flux linkage.

1870–75; link1 + -age

nonlinkage, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
linkage (ˈlɪŋkɪdʒ)
1.  the act of linking or the state of being linked
2.  a system of interconnected levers or rods for transmitting or regulating the motion of a mechanism
3.  electronics the product of the total number of lines of magnetic flux and the number of turns in a coil or circuit through which they pass
4.  genetics the occurrence of two genes close together on the same chromosome so that they are unlikely to be separated during crossing over and tend to be inherited as a single unit
5.  the fact of linking separate but related issues in the course of political negotiations

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

1874, from link + -age.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

linkage link·age (lĭng'kĭj)
An association between two or more genes such that the traits they control tend to be inherited together.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Finally, candidates must have a record of success in the effective linkage of
  financial aid to student enrollment and retention.
In one embodiment, a motor is coupled to the tuning linkage such that an
  operator can manually adjust the tuning via a motor.
Actually, if the team's claim holds up, it will be the first confirmed linkage
  of a specific gene to any complex behavioral trait.
They point out that this requires large-scale linkage of habitat to preserve
  gene flow of all species.
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